The classification of the Pterobranchia (Cephalodiscida and Graptolithina)


Authors: Maletz J

Published in: Bulletin of Geosciences, volume 89, issue 3; pages: 477 - 540; Received 1 July 2013; Accepted in revised form 5 February 2014; Online 7 May 2014

Keywords: Hemichordata, Pterobranchia, Graptolithina, taxonomy, evolution,

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This paper presents a proposal for a taxonomic approach to the classification of the Pterobranchia (Cephalodiscida and Graptolithina) to be adopted for the revision of the Treatise on Invertebrate Paleontology, Part V (Hemichordata), currently in preparation. A combination of traditional Linnaean taxonomy, supported by cladistic analyses in some groups is proposed herein as a practical solution for the classification of the Graptolithina as for many groups a cladistic analysis has never been attempted and is unlikely to be undertaken in the near future. The number of ranked taxa has been kept as low as possible, with all genus level taxa referred to a family. All families and higher taxonomic units are discussed, but new taxa have not been introduced. Paraphyletic (but not polyphyletic) taxa are accepted as useful units in this classification. A number of recently introduced taxonomic units, based on cladistic analyses (e.g. Eugraptoloida, Pan-Reclinata, Pan-Bireclinata), are discussed in the context of this classification and the usefulness of these taxa is critically evaluated. The solution proposed here opts not to name a number of nodes from the published cladistic analyses that potentially could be named and in some cases have been named - not to inflate the hierarchy of the used taxonomic system. Taxa are kept as close as possible to their original definition and not unnecessarily expanded or restricted. The taxonomy proposed here for the Graptolithina indicates that the extensive use of higher level taxa, e.g. orders for small groups of genera as has been done for many benthic graptolite groups in the past is unnecessary and should be avoided.


ALLMAN, G.J. 1872. On the morphology and affinities of graptolites. Annals and Magazine of Natural History, Fourth Series 9, 364-380.View article

ANDERSSON, K.A. 1907. Die Pterobranchier der schwedischen Südpolar-Expedition 1901-1903 nebst Bemerkungen über Rhabdopleura normanni Allman. Wissenschaftliche Ergebnisse der Schwedischen Südpolar-Expedition 1901-1903, Volume 5, 1-122.

ANDRES, D. 1977. Graptolithen aus ordovizischen Geschieben und die frühe Stammesgeschichte der Graptolithen. Paläontologische Zeitschrift 51, 52-93.View article

ANDRES, D. 1980. Feinstrukturen und Verwandtschaftsbeziehungen der Graptolithen. Paläontologische Zeitschrift 54, 129-170.View article

ANGELIN, N.P. 1854. Palaontologia Scandinavica. Part 1, Crustacea formationis transitionis. 93 pp. T.O. Weigel, Lipsiae [originally issued in 2 parts 1851, 1854; also Holmiae, Stockholm 1878, P.A. Norstedt & Söner; ed. G. Lindström].

AVERIANOW, B. 1931. Graptoloidea from the shales of the Ura-Tuibe region and the Zeravshan Valley, Turkestan. Transactions of the Geological and Prospecting Service of the USSR 101, 1-29.

BARRANDE, J. 1850. Graptolites de Boheme. 74 pp. Théophile Haase Fils, Prague. [published by the author]

BARROIS, C. 1893. Sur le Rouvilligraptus richardsoni de Cabrieres. Annales de la Société géologique du Nord 21, 107-112.

BATES, D.E.B. & KIRK, N.H. 1992. The ultrastructure, mode of construction and functioning of a number of Llandovery ancorate diplograptid and retiolitid graptolites. Modern Geology 17(1-3), 1-270.

BATES, D.E.B. & URBANEK, A. 2002. The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus. Acta Palaeontologica Polonica 47(3), 445-458.

BATES, D.E.B., KOZŁOWSKA, A. & LENZ, A.C. 2005. Silurian retiolitid graptolites: Morphology and evolution. Acta Palaeontologica Polonica 50(4), 705-720.

BATESON, W. 1885.The later stages in the development of Balanoglossus kowalevskii, with a suggestion as to the affinities of the Enteropneusta. Quarterly Journal of Microscopical Science 25, 81-122.

BEAVIS, F.C. 1972. The manubriate isograptids. Geological Magazine 109(3), 193-204.View article

BECKLY, A. & MALETZ, J. 1991. The Ordovician graptolites Azygograptus and Jishougraptus in Scandinavia and Britain. Palaeontology 34, 887-925.

BEKLEMISHEV, V.N. 1951a. On the systematic structure of Animals Vtorichnorotye (Deuterostomia), their origin and composition. Uspekhi sovremennoi biologii 32, 256-270.

BEKLEMISHEV, V.N. 1951b. [Russian editions in 1951, 1964] Osnovy sravnitelnoi anatomii bespozvonochnykh. 2 volumes, 430, 478 pp. Sovetskaya nauka, Moskva. [German edition: Grundlagen der vergleichenden Anatomie der Wirbellosen 1958 (Band 1. Promorphologie); 1960 (Band 2. Organologie). VEB Deutscher Verlag der Wissenschaften, Berlin.] [English edition: BEKLEMISHEV, V.N. 1970. Principles of Comparative Anatomy of Invertebrates. Vol. 1, 490 pp.; vol. 2, 529 pp.; Oliver and Boyd, Edinburgh.]

BENGTSON, S. & URBANEK, A. 1986. Rhabdotubus, a Middle Cambrian rhabdopleurid hemichordate. Lethaia 19(4), 293-308.View article

BERLESE, A. 1916. Centuria seconda di Acari nuovi. Redia 12, 125-177.

BOUČEK, B. 1933. Monographie der obersilurischen Graptolithen aus der Familie Cyrtograptidae. Práce geologicko-paleontologického ústavu Karlovy university v Praze 1, 1-84.

BOUČEK, B. 1941. Über neue Algenreste aus dem böhmischen Silur. Věstník Královské České společnosti nauk, 1-5.

BOUČEK, B. 1956. Graptolitová a dendroidová fauna klabavských břidlic (dß) z rokycanské Stráně. The graptolite and dendroid fauna of the Klabava Shales (dß) from the Stráň at Rokycany. Sborník Ústředního ústavu geologickeho, Oddíl paleontologický 22, 123-164 [in Czech], 165-196 [in Russian], 197-227 [in English].

BOUČEK, B. 1957. The dendroid graptolites of the Silurian of Bohemia. Rozpravy Ústředního ústavu geologického 23, 1-294.

BOUČEK, B. 1973. Lower Ordovician graptolites of Bohemia. 185 pp. Publishing House of the Czechoslovak Academy of Sciences, Prague.

BOUČEK, B., MIHAJLOVIC, M. & VESELINOVIC, M. 1976. Graptolites of Upper Silurian and Lower Devonian of Zvonacka Banja (Eastern Yugoslavia). Glas de l’Academie serbe des sciences et des arts, Classe des sciences mathématiques et naturelles 39, 79-114.

BOUČEK, B. & MÜNCH, A. 1944. Die Retioliten des mitteleuropäischen Llandovery und unteren Wenlock [Retioliti středoevropského Llandovery a spodního Wenlocku]. Bulletin international de l’Académie tcheque des Sciences 44, 527-579.

BOUČEK, B. & MÜNCH, A. 1952. Retioliti středoevropského svrchního wenlocku a ludlowu. [The central European Retiolites of the Upper Wenlock and Ludlow]. Sborník Ústředního ústavu geologického, Oddíl paleontologický 19, 1-151. [1-54, Czech text; 55-103, Russian text; 104-151 English text]

BOUČEK, B. & PŘIBYL, A. 1951. Taxonomy and phylogeny of some Ordovician graptolites. Bulletin international de l’Académie tcheque des Sciences 52(20), 1-17.

BOUČEK, B. & PŘIBYL, A. 1952. Contribution to our knowledge of the Cyrtograptids from the Silurian of Bohemia and on their stratigraphical importance. Rozpravy České akademie věd, Řada matematicko-přírodovědných věd 62(9), 1-24.

BRONN, H.G. 1835. Lethaea Geognostica, Erster Band, das Übergangs-, bis Oolithen-Gebirge enthaltend. 768 pp. Schweizerbart, Stuttgart.

BRONN, H.G. 1849. Handbuch der Geschichte der Natur. Dritter Band, Zweite Abtheilung. II. Theil: Organisches Leben (Schluß). Index palaeontologicus oder Ueberblick der bis jetzt bekannten fossilen Organismen. 1106 pp. Schweizerbart, Stuttgart.

BOURLAT, S.J., JULIUSDOTTIR, T., LOWE, C.J., FREEMAN, R., ARONOWICZ, J., KIRSCHNER, M., LANDER, E.S., THORNDYKE, M., NAKANO, H., KOHN, A.B., HEYLAND, A., MOROZ, L.L., COPLEY, R.R. & TELFORD, M.J. 2006. Deuterostome phylogeny reveals monophyletic chordates and the new phylum Xenoturbellida. Nature 444, 85-88.View article

BRUMMITT, R.K. 1996. In defense of paraphyletic taxa, 371-384. In VAN DER MAESEN, L.J.G., VAN DER BURGT, X.M. & VAN MEDENBACH VAN ROOY, J.M. (eds) The Biodiversity of African Plants. Proceedings, XIVth AETFAT Congress, 22-27, August 1994, Wageningen. Kluwer Academic Publishers, Dordrecht.

BRUMMITT, R.K. 2003. Further dodged defense of paraphyletic taxa. Taxon 52, 803-804.View article

BRUMMITT, R.K. & SOSEF, M.S.M. 1998. Paraphyletic taxa are inherent in Linnaean classification - a reply to Freudenstein. Taxon 47, 411-412.View article

BULMAN, O.M.B. 1927a. A monograph of British dendroid graptolites. Palaeontographical Society, London Monograph 79 (367), 1-28.

BULMAN, O.M.B. 1927b. Koremagraptus, a new dendroid graptolite. Annals and Magazine of Natural History, Series 9(19), 344-347.View article

BULMAN, O.M.B. 1929. The genotypes of graptolites. Annals and Magazine of Natural History 4(20), 169-185.View article

BULMAN, O.M.B. 1933. On the graptolites prepared by Holm. VI. Structural characters of some Dictyonema and Desmograptus species from the Ordovician and Silurian rocks of Sweden and the east Baltic Region. Arkiv för Zoologi 26A(5), 1-52. [plates separate, large size]

BULMAN, O.M.B. 1934. A monograph of British dendroid graptolites, Part III. Palaeontographical Society Monograph 86(392), xxxiii-lx, 65-92.

BULMAN, O.M.B. 1936. Rhaphidograptus, a new graptolite genus. Geological Magazine 73(1), 19-26.View article

BULMAN, O.M.B. 1938. Graptolithina, 1-92. In SCHINDEWOLF, O.H. (ed.) Handbuch der Paläozoologie, vol. 2D. Borntraeger, Berlin.

BULMAN, O.M.B. 1941. Some dichograptids of the Tremadocian and Lower Ordovician. Annals and Magazine of Natural History, Series 2(7), 100-121.View article

BULMAN, O.M.B. 1942. The structure of the dendroid graptolites. Geological Magazine 79(5), 284-290.View article

BULMAN, O.M.B. 1945. A monograph of the Caradoc (Balclatchie) graptolites from limestones in Laggan Burn, Ayrshire, Part 1. Palaeontographical Society Monograph 98(430), 1-42. View article

BULMAN, O.M.B. 1950. Graptolites from the Dictyonema Shales of Quebec. Quarterly Journal of the Geological Society of London 106, 63-99.View article

BULMAN, O.M.B. 1953. Some graptolites from the Ogygiocaris Series (4a ) of the Oslo district. Arkiv för Mineralogi och Geologi 1(17), 509-518.

BULMAN, O.M.B. 1955. Graptolithina, xvii + 101 pp. In MOORE, R.C. (ed.) Treatise on Invertebrate Paleontology, Part V. Geological Society of America & University of Kansas Press, Lawrence.

BULMAN, O.M.B. 1970. Graptolithina, xxxii + 163 pp. In TEICHERT, C. (ed.) Treatise on Invertebrate Paleontology, Part V, second edition. Geological Society of America and University of Kansas Press, Lawrence.

BULMAN, O.M.B. & RICKARDS, R.B. 1968. Some new diplograptids from the Llandovery of Britain and Scandinavia. Palaeontology 11(1), 1-15.

CAMERON, C.B., SWALLA, B.J. & GAREY, J.R. 2000. Evolution of the chordate body plan: New insights from phylogenetic analysis of deuterostome phyla. Proceedings of the National Academy of Sciences (USA) 97(9), 4469-4474.View article

CANTINO, P.D. & DE QUEIROZ, K. 2010. International Code of Phylogentic Nomenclature Version 4c (PhyloCode).

CANNON, J.T., RYCHEL, A.L., ECCLESTON, H., HALANYCH, K.M. & SWALLA, B.J. 2009. Molecular phylogeny of Hemichordata, with updated status of deep-sea enteropneusts. Molecular Phylogenetics and Evolution 52, 17-24.View article

CARLUCCI, J. 2008. Phylogenetic analysis, systematics, and evolution of early Ordovician graptolites. 128 pp. MSc. thesis, SUNY Buffalo.

CARRUTHERS, W. 1858. Dumfriesshire graptolites with description of three new species. Proceedings of the Royal Society of Edinburgh 1, 466-470.

CASTER, K.E. & KJELLESVIG-WAERING, E.N. 1955. Family Megalograptidae Caster, K.E. & Kjellesvig-Waering, E.N. 1955, p. P36. In MOORE, R.C. (ed.) Treatise on Invertebrate Paleontology, Part P, Arthropoda 2. Geological Society of America & University of Kansas Press, Lawrence.

CASTER, K.E. & KJELLESVIG-WAERING, E.N. 1964. Upper Ordovician eurypterids of Ohio. Palaeontographica Americana 4, 301-358.

CHAPMAN, A.J., RICKARDS, R.B. & GRAYSON, R.F. 1993. The Carboniferous dendroid graptolites of Britain and Ireland. Proceedings of the Yorkshire Geological Society 49(4), 295-319.View article

CHAPMAN, F. 1917. Report on Cambrian fossils from Knowley East, near Heathcote. Geological Survey of Victoria, Records 4(1), 87-102.

CHAPMAN, F. 1919. On some hydroid remains of Lower Palaeozoic age from Monegetta, near Lancefield. Proceedings of the Royal Society of Victoria, New Series 31(2), 388-393.

CHAPMAN, F. & THOMAS, D.E. 1936. The Cambrian Hydroidea of the Heathcote and Monegeeta Districts. Proceedings of the Royal Society of Victoria, New Series 48(2), 193-212.

CHEN, X., SUN, X.R. & HAN, N.R. 1964. Yushanograptus, a new graptolite genus from the Ningkuo Shale (Lower Ordovician) of Yushan, north-eastern Jiangxi (Kiangsi). Acta Palaeontologica Sinica 12(2), 236-240.

CHEN, X. & ZHANG, Y.D. 1996. Isograptids of China, 82-89. In WANG, H.Z. & WANG, X.L. (eds) Centennial memorial volume of Prof. Sun Yunzhu (Y.C. Sun): palaeontology and stratigraphy. China University of Geosciences Press, Beijing.

CHO, H.S., KIM, J.Y. & JIN, Y.P. 2009. Phylogenetic relationships among Adelograptus, Ancoragraptus and Psigraptus. Geosciences Journal 13(2), 133-139.View article

CHU, M.T. 1965. New materials of Sinograptidae. Acta Palaeontologica Sinica 13(1), 94-106.

CLARK, T.H. 1924. The paleontology of the Beekmantown Series at Levis, Quebec. Bulletin of American Paleontology 10(41), 1-151.

CONE, M.R. 2004. A cladistic and biostratigraphic analysis of Upper Ordovician climacograptid graptolites (Family Diplograptidae). 107 pp. Unpublished MS thesis, University at Buffalo, SUNY.

COOPER, R.A. 1973. Taxonomy and evolution of the genus Isograptus Moberg in Australasia. Palaeontology 16(1), 45-115.

COOPER, R.A. & FORTEY, R.A. 1982. The Ordovician graptolites of Spitsbergen. Bulletin of the British Museum (Natural History), Geology Series 36(3), 157-302.

COOPER, R.A. & LINDHOLM, K. 1985. The phylogenetic relationships of the graptolites Tetragraptus phyllograptoides and Pseudophyllograptus cor. Geologiska Föreningens i Stockholm Förhandlingar 106(3), 279-291.View article

COOPER, R.A., MALETZ, J., WANG, H.F. & ERDTMANN, B.-D. 1998. Taxonomy and evolution of earliest Ordovician graptoloids. Norsk Geologisk Tidsskrift 78(1), 3-32.

COOPER, R.A. & MCLAURIN, A.N. 1974. Apiograptus gen. nov. and the origin of the biserial graptoloid rhabdosome. Special Papers in Palaeontology 13, 75-85.

COOPER, R.A. & NI, Y.N. 1986. Taxonomy, phylogeny and variability of Pseudisograptus Beavis. Palaeontology 29, 313-363.

CROWTHER, P.R. 1981. The fine structure of graptolite periderm. Special Papers in Palaeontology 26, 1-119.

CROWTHER, P. & RICKARDS, B. 1977. Cortical bandages and the graptolite zooid. Geologica et Palaeontologica 11, 9-46.

CUERDA, A.J., RICKARDS, R.B. & CINGOLANI, C. 1988. A new Ordovician-Silurian boundary section in San Juan Province, Argentina, and its definitive graptolite fauna. Journal of the Geological Society of London 145(5), 749-757.View article

DAVIES, K.A. 1929. Notes on the graptolite faunas of the Upper Ordovician and Lower Silurian. Geological Magazine 66, 1-27.View article

DAWSON, D.H. & MELCHIN, M.J. 2007. A possible transitional stage between the resporption porus and the primary porus in early monograptid graptolites. Acta Palaeontologica Sinica 46 (Suppl.), 89-94.

DAWSON, J.W. 1868. Acadian Geology. The Geological Structure, Organic Remains, and Mineral Resources of Nova Scotia, New Brunswick, and Prince Edward Island. Second edition. 769 pp. Macmillan and Co., London.View article

DE QUEIROZ, K. 2006. The PhyloCode and the distinction between taxonomy and nomenclature. Systematic Biology 55(1), 160-162.View article

DE QUEIROZ, K. 2007. Toward an integrated system of clade names. Systematic Biology 56(6), 956-974.View article

DE QUEIROZ, K. & GAUTHIER, J. 1990. Phylogeny as a central principle in taxonomy: phylogenetic definitions of taxonomic names. Systematic Zoology 39(4), 307-322.View article

DECKER, C.E. 1945. The Wilberns Upper Cambrian graptolites from Mason, Texas. The University of Texas Publication 4401, 13-61.

DOBROWOLSKA, K. 2013. Reconstruction of the proximal ends of retiolitid rhabdosomes (Graptolithina) from the Upper Wenlock and the Lower Ludlow. Paläontologische Zeitschrift 87, 1-17.View article

DURMAN, P. & SENNIKOV, N.V. 1993. A new rhabdopleurid hemichordate from the Middle Cambrian of Siberia. Palaeontology 36(2), 283-296.

EBACH, M.C., WILLIAMS, D.M. & MORRONE, J.J. 2006. Paraphyly is bad taxonomy. Taxon 55, 1039-1040.View article

EGENHOFF, S. & MALETZ, J. 2007. Graptolites as indicators of maximum flooding surfaces in monotonous deep-water shelf successions. Palaios 22, 374-384.View article

EICHWALD, E.J. 1855. Beitrag zur geographischen Verbreitung der fossilen Thiere Russlands. Alte Periode. Bulletin de la Société impériale des naturalistes de Moscou 28(4), 433-466.

EISEL, R. 1912. Über zonenweise Entwicklung der Rastriten und Demirastriten. 53./54. Jahresbericht der Gesellschaft von Freunden der Naturwissenschaften Gera, 27-43. [different pagination in reprint, 1-17]

EISENACK, A. 1932. Neue Mikrofossilien des baltischen Silurs. II. (Foraminiferen, Hydrozoen, Chitinozoen u. a.). Paläontologische Zeitschrift 14, 257-277.View article

EISENACK, A. 1934. Neue Mikrofossilien des baltischen Silurs, III und Neue Mikrofossilien des böhmischen Silurs, I. Paläontologische Zeitschrift 16, 52-76.View article

EISENACK, A. 1935. Neue Graptolithen aus Geschieben baltischen Silurs. Paläontologische Zeitschrift 17, 73-90.View article

EISENACK, A. 1937. Neue Mikrofossilien des baltischen Silurs. 4. Paläontologische Zeitschrift 19, 217-243.View article

EISENACK, A. 1941. Epigraptus bidens n. g. n. sp., eine neue Graptolithenart des baltischen Ordoviziums. Zeitschrift für Geschiebeforschung und Flachlandsgeologie 17(1), 24-28.

EISENACK, A. 1951. Retioliten aus dem Graptolithengestein. Palaeontographica A 100(5-6), 129-163.

EISENACK, A. 1974. Einige neue Graptolithen aus dem Ordovizium des Baltikums, ferner über Epigraptus und andere Idiotubidae. [Some new graptolites from the Baltic Ordovician and about Epigraptus and other Idiotubidae]. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte 1974(11), 664-674.

EISENACK, A. 1982. Einige problematische Mikrofossilien [Some problematic microfossils]. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte 1982, 629-636.

ELLES, G.L. & WOOD, E.M.R. 1902. A monograph of British Graptolites. Part II - Dichograptidae. Palaeontographical Society Monograph 56(265), i-xxviii, 55-102.

ELLES, G.L. & WOOD, E.M.R. 1907. A monograph of British Graptolites. Part 6. Palaeontographical Society Monograph 61(297), xcvii-cxx, 217-272.

ELLES, G.L. & WOOD, E.M.R. 1908. A monograph of British Graptolites. Part 7, Palaeontographical Society Monograph 62(305), cxxxi-cxlviii, 273-358.

EMMONS, E. 1855. American Geology, containing a statement of the Principles of the Science, with full illustrations of the characteristic American fossils also an atlas and a geological map of the United States. Part II. 251 pp. J. Munsell, 1875, Albany.

ERDTMANN, B.-D. 1967. A new fauna of early Ordovician graptolites from St. Michel, Quebec. Canadian Journal of Earth Sciences 4(3), 335-355.View article

ERDTMANN, B.-D. 1988. The earliest Ordovician nematophorid graptolites: taxonomy and correlation. Geological Magazine 125(4), 327-348.View article

ERDTMANN, B.-D., MALETZ, J. & GUTIÉRREZ-MARCO, J.C. 1987. The new early Ordovician (Hunneberg Stage) graptolite genus Paradelograptus (Kinnegraptidae), its phylogeny and biostratigraphy. Paläontologische Zeitschrift 61, 109-131.View article

ERDTMANN, B.-D. & VANDENBERG, A.H.M. 1985. Araneograptus gen. nov. and its two species from the late Tremadocian (Lancefieldian, La2) of Victoria. Alcheringa 9(1-2), 49-63.View article

FANG, Y., LIANG, S., ZHANG, D. & YU, J. 1990. Stratigraphy and graptolite fauna of Lishuwo Formation from Wuning, Jiangxi. 155 pp. Nanjing University Publishing House, Nanjing.

FARJON, A. 2007. In defense of a conifer taxonomy which recognizes evolution. Taxon 56(3), 639-641.View article

FATKA, O., KRAFT, P. & SZABAD, M. 2012. A first report of Sphenothallus Hall, 1847 in the Cambrian of Variscan Europe. Comptes Rendus Palevol 11, 539-547.View article

FINNEY, S.C. 1978. The affinities of Isograptus, Glossograptus, Cryptograptus, Corynoides, and allied graptolites. Acta Palaeontologica Polonica 23(4), 481-495.

FINNEY, S.C. 1980. Thamnograptid, dichograptid and abrograptid graptolites from the Middle Ordovician Athens Shale of Alabama. Journal of Paleontology 54(6), 1184-1208.

FINNEY, S.C. 1985. Nemagraptid graptolites from the Middle Ordovician Athens Shale, Alabama. Journal of Paleontology 59(5), 1100-1137.

FINNEY, S.C. & CHEN, X. 1984. Bergstroemograptus n. gen. crawfordi (Harris) from the Ordovician of western Newfoundland. Canadian Journal of Earth Sciences 21(10), 1194-1199.View article

FOERSTE, A.F. 1923. Notes on Medina, Niagaran and Chester fossils. Bulletin of the Scientific Laboratories of Denison University 20, 37-120.

FORTEY, R.A. & COOPER, R.A. 1986. A phylogenetic classification of the graptoloids. Palaeontology 29(4), 631-654.

FORTEY, R.A., ZHANG, Y.D. & MELLISH, C. 2005. The relationships of biserial graptolites. Palaeontology 48(6), 1241-1272.View article

FOWLER, G.H. 1892. The morphology of Rhabdopleura normanni Allm., 293-297. In Festschrift zum 70ten Geburstag Rudolf Leuckarts. 293 pp. W. Engelmann, Leipzig.

FRECH, F. 1897. Lethaea geognostica oder Beschreibung und Abbildung für die Gebirgs-Formationen bezeichnendsten Versteinerungen. Herausgegeben von einer Vereinigung von Palaeontologen, 1. Teil - Lethaea Palaeozoica, 544-684. E. Schweizerbart’sche Verlagshandlung, Stuttgart.

GE, M.Y. 1988. New materials of Azygograptidae and its significance. Acta Palaeontologica Sinica 27(2), 205-212.

GE, M.Y. 1990. Silurian graptolites from Chengkou, Sichuan. Palaeontologica Sinica, 179, New Series B 26, 1-157.

GEGENBAUR, C. 1870. Grundzüge der vergleichenden Anatomie. Zweite, umgearbeitete Auflage. 892 pp. Wilhelm Engelmann, Leipzig.

GEINITZ, H.B. 1852. Die Versteinerungen der Grauwackenformation in Sachsen und den angrenzenden Länder-Abtheilungen. Heft 1. Die Silurische Formation. Die Graptolithen, ein monographischer Versuch zur Beurtheilung der Grauwackenformation in Sachsen und den angrenzenden Länderabtheilungen sowie der Silurischen Formation überhaupt. 58 pp. Verlag von Wilhelm Engelmann, Leipzig.

GEINITZ, H.B. 1866. Review J. Hall: Graptolites of the Quebec Group. Neues Jahrbuch für Mineralogie, Geologie und Palaontologie, Jahrgang 1866, 121-125.

GOLIKOV, A.N. 1969. Novye rannevenlokskiye graptolity semeystva Cyrtograptidae na yugo-zapade Tyan’-Shanya. Paleontologicheskiy Zhurnal 4, 64-75. [English translation: GOLIKOV, A.N. 1969. New early Wenlockian graptolites of the family Cyrtograptidae from southwestern Tien Shan. Paleontological Journal 3(4), 506-519.]

GRANT, C.C. 1893. Geological Notes. Read before the Geological Section of the Hamilton Association. Notes on some few fossil organisms. No. 1. Journal and Proceedings of the Hamilton Association for session 1892-93, 9, 113-115.

GÜRICH, G. 1908. Leitfossilien. Ein Hilfsbuch zum Bestimmen von Versteinerungen bei geologischen Arbeiten in der Sammlung und im Felde. Erste Lieferung: Kambrium und Silur. 95 pp. Verlag Gebrüder Bornträger, Berlin.

GÜRICH, G. 1928. Über Dawsonia Nicholson, Peltocaris Salter und über die Graptolithen-Studien von E. Manck. Zentralblatt für Mineralogie, Geologie und Paläontologie 29B, 531-537.

GURLEY, R.R. 1896. North American graptolites, new species and vertical ranges. Journal of Geology 4, 63-102, 291-311.View article

GUTIÉRREZ-MARCO, J.C. 1986. Notas sobre el desarrollo y estructura proximal del rhabdosoma en algunos graptolitos ordovicicos del SO. De Europa. Paleontologia I Evolucio 20, 191-201.

HABERFELNER, E. 1936. Neue Graptoliten aus dem Gotlandium von Böhmen. Geologica Balkanica 2, 87-95.

HADDING, A. 1915. Om Glossograptus, Cryptograptus och tvenne dem närstaende graptolitsläkten. Geologiska Föreningen i Stockholm Förhandlingar 37, 303-336.View article

HAECKEL, E. 1866. Generelle Morphologie der Organismen. Allgemeine Grundzüge der organischen Formen-Wissenschaft, mechanisch begründet durch die von Charles Darwin reformirte Descendenz-Theorie. Erster Band: Allgemeine Anatomie der Organismen. 574 pp. Verlag Georg Reimer, Berlin. View article

HAECKEL, E. 1868. Natürliche Schöpfungsgeschichte. Gemeinverständliche wissenschaftliche Vorträge über die Entwicklungslehre im Allgemeinen und diejenige von Darwin, Goethe und Lamarck im Besonderen, über die Anwendung derselben auf den Ursprung des Menschen und andere damit zusammenhängende Grundfragen der Naturwissenschaft. 568 pp. Verlag Georg Reimer, Berlin.

HALANYCH, K.M. 1995. The phylogenetic position of the pterobranch hemichordates based on 18S rDNA sequence data. Molecular Phylogenetics and Evolution 4, 72-76.View article

HALL, J. 1847. Paleontology of New York. Volume I. Containing descriptions of the organic remains of the Lower Division of the New-York System (equivalent to the Lower Silurian rocks of Europe). 338 pp. C. Van Benthuysen, Albany.

HALL, J. 1851. New genera of fossils corals from the Report of James Hall, on the Palaeontology of New York. American Journal of Science 11, 398-401.

HALL, J. 1858. Report on Canadian Graptolites, 1-39. In Sir William E. Logan’s Report of Progress for 1857. Geological Survey of Canada, John Lovell, Montreal.

HALL, J. 1861. Report of the Superintendent of the Geological Survey, exhibiting the progress of the work, January 1, 1861 (including descriptions of new species of fossils from the investigations of the survey). 52 pp. Wisconsin Geological Survey, Madison.

HALL, J. 1865. Figures and descriptions of Canadian organic remains. Decade II, Graptolites of the Quebec Group. Geological Survey of Canada. 154 pp. A.B. Dawson Brothers, Montreal.

HALL, J. 1868. Introduction to the study of the Graptolitidae. New York State Museum Natural History 20th Annual Report, 169-240.

HALL, J. 1879. Descriptions of new species of fossils from the Niagara Formation at Waldron, Indiana. 20 pp. J. Munsell, Printer, Albany, New York. [same as HALL, J. 1883. Descriptions of new species of fossils from the Niagara Formation at Waldron, Indiana. Transactions of the Albany Institute, 57-76.]

HALL, T.S. 1914. Victorian graptolites, Part 4. Some new or little known species. Proceedings of the Royal Society of Victoria, New Series 27, 104-118.

HARMER, S.F. 1905. The Pterobranchia of the Siboga-Expedition with an account of other species. Siboga Expedition Monograph 26, 1-133.

HARRIS, W.J. 1916. The paleontological sequence of the Lower Ordovician rocks in the Castlemaine District. Proceedings of the Royal Society of Victoria, New Series 29, 50-74.

HARRIS, W.J. 1926. Victorian graptolites, part II. Proceedings of the Royal Society of Victoria, New Series 38, 55-61.

HARRIS, W.J. 1933. Isograptus caduceus and its allies in Victoria. Proceedings of the Royal Society of Victoria, New Series 46, 79-114.

HARRIS, W.J. & KEBLE, R.A. 1932. Victorian graptolite zones, with correlations and descriptions of species. Proceedings of the Royal Society of Victoria, New Series 44, 25-48.

HARRIS, W.J. & THOMAS, D.E. 1940. Victorian graptolites (New Series), Part VIII. Mining and Geological Journal of Victoria 2, 197-198.

HARRIS, W.J. & THOMAS, D.E. 1941. Victorian graptolites (New Series) Part IX. Zygograptus, a new genus of graptolites. Mining and Geological Journal 2(5), 308-310.

HEMMANN, M. 1951. Über Linograptus Frech 1897 und Undagraptus stolzenbergensis n. g. n. sp. aus Ostthüringen. Hallesches Jahrbuch für Mitteldeutsche Erdgeschichte 1(2), 74-75.

HENNIG, W. 1950. Grundzüge einer Theorie der phylogenetischen Systematik. 370 pp. Deutscher Zentralverlag, Berlin.

HENNIG, W. 1965. Phylogenetic Systematics. Annual Review of Entomology 10, 978-1016.View article

HISINGER, H. 1837. Lethaea Suecica seu Petrifacta Suecica. Supplementum 1. 124 pp. D.A. Norstedt et filii, Stockholm.

HOLM, G. 1881a. Tvenne nya slägten af familjen Dichograptidae Lapw. Öfversigt af Konglika Vetenskaps-Akademiens Förhandlingar 9, 45-51.

HOLM, G. 1881b. Bidrag till kännedomen om Skandinaviens graptoliter I. Pterograptus, ett nytt graptolitslägte. Öfversigt af Konglika Vetenskaps-Akademiens Förhandlingar 1881(4), 71-84.

HOLM, G. 1895. Om Didymograptus, Tetragraptus och Phyllograptus. Geologiska Föreningens I Stockholm Förhandlingar 17, 319-343. [English translation: HOLM, G. 1895. On Didymograptus, Tetragraptus, and Phyllograptus. Geological Magazine 11, 433-441, 481-492.]View article

HONG, Y.C. 1957. Discovery of the early Caradocian (Upper Ordovician) graptolites and their stratigraphic meaning. Acta Geologica Sinica 37, 475-511. [in Chinese, Russian abstract]

HOPKINSON, J. 1869. On British Graptolites. Journal of the Quekett Microscopical Club 1, 151-166.

HOPKINSON, J. 1871. On Dicellograpsus, a new genus of graptolites. Geological Magazine 8, 20-26.View article

HOPKINSON, J. & LAPWORTH, C. 1875. Descriptions of the graptolites of the Arenig and Llandeilo rocks of St. David’s. Quarterly Journal of the Geological Society 31, 631-672.View article

HORST, C.J. VAN DER 1936. Planctosphaera and Tornaria. Quarterly Journal of Microscopical Science 78, 605-613.

HOU, X.G., ALDRIDGE, R.J., SIVETER, D.J., SIVETER, D.J., WILLIAMS, M., ZALASIEWICZ, J. & MA, X.Y. 2011. An Early Cambrian Hemichordate Zooid. Current Biology 21, 612-616.View article

HSÜ, S.C. 1959. A new graptolite fauna of the Lower Ordovician shale of Tsaidam, Chinghai Province. Acta Palaeontologica Sinica 7, 161-192.

HSÜ, S.C. & CHAO, Y.T. 1976. The evolution and systematics of the Family Sinograptidae. Acta Geologica Sinica 1976(2), 121-140.

HU, S. 2005. Taphonomy and palaeoecology of the early Cambrian Chengjiang biota from eastern Yunnan, China. Berliner paläobiologische Abhandlungen 8, 1-189.

HUDSON, G.H. 1915. Ceramograptus ruedemanni, a new genus and species of Graptoloidea, and notes on Urasterella pulchella, Billings. The Ottawa Naturalist 28(10), 129-130.

HUNDT, R. 1935. Eine neue Graptolithengattung aus dem deutschen Silur. Forschungen und Fortschritte: Nachrichtenblatt der Deutschen Wissenschaft und Technik 11(10), 130.

HUNDT, R. 1936. Graptolithenleben und Graptolithensterben im Mitteldeutschen Silurmeer. Zeitschrift für die gesamte Naturwissenschaft 1, 21-37.

HUNDT, R. 1939 (the book cover states 1940, the internal cover says 1939). Das Mitteldeutsche Graptolithenmeer. 395 pp. Martin Boerner Verlag, Halle (Saale).

HUNDT, R. 1940. Graptolithen aus den Phycodesschichten Ostthüringens. Beiträge zur Geologie von Thüringen 5, 242-253.

HUNDT, R. 1942. Beiträge zur Kenntnis des Mitteldeutschen Graptolithenmeers. Beiträge zur Geologie von Thüringen 6, 205-231.

HUNDT, R. 1949. Neue Graptolithenfunde aus dem Gotlandium Ostthüringens, 18-23. In HUNDT, R. Zur Erforschung des Silurs Ostthüringens. Zweigniederlassung Gera: Geologischer Verein von Gera und Umgebung, Thüringer Volksverlag, Weimar.

HUNDT, R. 1950. Neue Forschungsergebnisse von gotlandischen Graptolithen. Experientia 6, 293-294.View article

HUNDT, R. 1951. Beitrag zur Kenntnis der mitteldeutschen Graptolithenfauna aus dem Weinbergbruch bei Hohenleuben und dem Hässlich bei Weckersdorf. Jahrbuch des Kreismuseums Hohenleuben-Reichenfels 1, 46-61.

HUNDT, R. 1953a. Graptolithen. Neue Erkenntnisse über die Leitversteinerungen der Silurformation. Die Neue Brehm-Bücherei. Heft 103. 112 pp. Akademische Verlagsgesellschaft Geest & Portig K.-G., Leipzig. [2. edition 2006. Westharp Wissenschaften, Hohenwarsleben].

HUNDT, R. 1953b. Eine neue Graptolithengattung (Cameragraptus gen. nov.) aus dem Unteren Gotlandium Ostthüringens. Jahrbuch des Kreismuseums Hohenleuben-Reichenfels 3, 1-13. [no pagination]

HUNDT, R. 1959. Der Weinbergbruch bei Hohenleuben (Kreis Zeulenroda) ein weltbekannter Graptolithenfundplatz. Jahrbuch der Kreismuseums Hohenleuben, Reichenfels 1959, 5-29.

HUNDT, R. 1965. Aus der Welt der Graptolithen. 208 pp. Commercia Verlag, Berlin & Bonn.

HUO, S.C. 1957. Some Silurian graptolites of the Family Retiolitidae from Liangshan, Hanchung. Acta Palaeontologica Sinica 5, 513-522.

HUTT, J.E. 1974. The development of Clonograptus tenellus and Adelograptus hunnebergensis. Lethaia 7, 79-92.View article

HYMAN, L.H. 1959. The Invertebrates: Smaller Coelomate Groups, vol. 5: Chapter 17, 72-207. In The enterocoelous coelomates - Phylum Hemichordata. McGraw-Hill Book Company, Inc., New York, London, Toronto.

ICZN 1954a. Opinion 197. Suppression, under the plenary powers, of the generic name “Graptolithus” Linnaeus, 1868 (class Graptolithina) and of the specific name “scalaris” Linnaeus, 1768, as published in the combination “Graptolithus scalaris”. Opinions and declarations rendered by the International Commission on Zoological Nomenclature 3(16), 207-216.

ICZN 1954b. Opinion 198. Suppression under the plenary powers, of the generic names “Lomatoceras” Bronn, 1834, and “Monoprion” Barrande, 1850 (Class Graptolithina) and validation of the generic name “Monograptus” Geinitz, 1852. Opinions and declarations rendered by the International Commission on Zoological Nomenclature 3(17), 217-228.

ICZN 1954c. Opinion 199. Suppression, under the Plenary Powers, of the generic name Gladiolites Barrande, 1850, and validation of the name Retiolites Barrande, 1850 (Class Graptolithina). Opinions and declarations rendered by the International Commission on Zoological Nomenclature 3(18), 229-238.

ICZN 1963. Opinion 650. Graptolite generic name: validation of certain emendations under the plenary powers. Bulletin of Zoological Nomenclature 20(2), 105.

JAANUSSON, V. 1960. Graptoloids from the Ontikan and Viruan (Ordov.) limestones of Estonia and Sweden. Bulletin of the Geological Institutions of the University of Uppsala 38 (3-4), 289-366.

JAANUSSON, V. 1965. Two multiramous graptoloids from the Lower Didymograptus Shale of Scandinavia. Geologiska Föreningens i Stockholm Förhandlingar 86(4), 413-432.View article

JACKSON, D.E. 1967. Psigraptus, a new graptolite genus from the Tremadocian of Yukon, Canada. Geological Magazine 104(4), 317-321.View article

JACKSON, D.E. & BULMAN, O.M.B. 1970. On the generic name Trigonograptus Nicholson, 1869. Proceedings of the Geological Society of London 1663, 107-109.

JACKSON, D.E. & LENZ, A.C. 1999. Occurrences of Psigraptus and Chigraptus gen. nov. in the Tremadoc of the Yukon Territory, Canada. Geological Magazine 136(2), 153-157.View article

JACKSON, D.E. & LENZ, A.C. 2003. Taxonomic and biostratigraphical significance of the Tremadoc graptolite fauna from northern Yukon Territory, Canada. Geological Magazine 140(2), 131-156.View article

JAEGER, H. 1978. Entwicklungszüge (Trends) in der Evolution der Graptolithen. Schriftenreihe für geologische Wissenschaften 10, 5-58.

JAEGER, H. 1992. Ein dendroider Graptolith (Ophigraptus hercyniae n. g. n. sp.) von der Unter-/Mitteldevon-Grenze im Harz (Deutschland). Paläontologische Zeitschrift 66(1-2), 123-128.View article

JAEKEL, O. 1889. Über das Alter des sog. Graptolithengesteins mit besonderer Berücksichtigung der in demselben enthaltenen Graptolithen. Zeitschrift der deutschen geologischen Gesellschaft 41, 653-716.

JAHN, J.J. 1892. Vorläufiger Bericht über die Dendroideen des Böhmischen Silur. Sitzungsberichte der Kaiserlich-königlichen Akademie der Wissenschaften, Mathematisch-naturwissenschaftliche Klasse 51, Abtheilung 1, 642-649.

JIAO, X. [QIAO, X.]1977. Kalpinograptus, a new graptolite genus from the Saergan Formation in Kalpin of Xinjiang. Acta Palaeontologica Sinica 16(2), 287-292.

JIAO, S.D. 1981. Some new graptolites from the Ningkuo Formation (Lower Ordovician) of Zhejiang. Acta Palaeontologica Sinica 20(1), 65-70.

JIN, Y. & WANG, X.F. 1977. The discovery of graptolites in the Baishuxi Formation of the early Ordovician in central Hunan and the multiramous graptolites in the Qiaotingzi Formation. Professional Papers in Stratigraphy and Palaeontology 3, 74-85. [in Chinese]

JOHN, C.C. 1931. Cephalodiscus. Discovery Reports 3, 223-260.

JOHNSTON, K.J., JOHNSTON, P.A. & POWELL, W.G. 2009. A new, Middle Cambrian, Burgess Shale-type biota, Bolaspidella Zone, Chancellor Basin, southeastern British Columbia. Palaeogeography, Palaeoclimatology, Palaeoecology 277, 106-126.View article

KENRICK, P., KVAČEK, Z. & BENGTSON, S. 1999. Semblant land plants from the Middle Ordovician of the Prague Basin reinterpreted as animals. Palaeontology 42(6), 991-1002.View article

KHALETZSKAYA, O.N. (also spelled CHALETSKAYA, O.N.) 1962. Graptolites from the Llandovery of Western Tian-Shan, 54-76. In VERKHOV, V.I. et al. (eds) Stratigrafia y paleontologya Uzbekistana y sopredelnich raionov [Stratigraphy and palaeontology of Usbekistan and adjacent regions]. Institut geologii, Akademiya nauk Uzbetskoi S.S.R., Tashkent. [in Russian]

KOJIMA, J.-I. 2003. Apomorphy-based definition also pinpoints a node, and PhyloCode names prevent effective communication. Botanical Review 69(1), 44-58.View article

KOMAI, T. 1949. Internal structure of the pterobranch Atubaria heterolopha Sato, with an appendix on the homology of the notochord. Proceedings of the Japan Academy 25, 19-24.View article

KOREN’, T.N. 1962. Novyi siluriiskii rod Uralograptus. Paleontologicheskiy Zhurnal 3, 137-138.

KOREN’, T.N. 1979. Pacificograptus - novyy rod pozneordovikskikh diplograptid. Paleontologicheskiy Zhurnal 1979(1), 69-74. [English translation: Pacificograptus, a new Late Ordovician diplograptid genus. Paleontological Journal 13(1), 65-70.]

KOREN’, T.N. & BJERRRESKOV, M. 1997. Early Llandovery monograptids from Bornholm and the southern Urals: taxonomy and evolution. Bulletin of the Geological Society of Denmark 44, 1-43.

KOREN’, T.N. & RICKARDS, R.B. 1996. Taxonomy and evolution of Llandovery biserial graptoloids from the southern Urals, western Kazakhstan. Special Papers in Palaeontology 54, 1-103.

KOZŁOWSKA, A. & BATES, D.E.B. 2008. Kirkigraptus, a new retiolitid graptolite from Poland. Acta Palaeontologica Polonica 53, 105-112.View article

KOZŁOWSKA, A., BATES, D.E.B. & PIRAS, S. 2010. A new Silurian graptolite, Reticuloplectograptus, and its bearing on retiolitid evolution. Palaeontology 53(6), 1411-1417.View article

KOZŁOWSKA-DAWIDZIUK, A. 1990. The genus Gothograptus (Graptolithina) from the Wenlock of Poland. Acta Palaeontologica Polonica 35, 191-209.

KOZŁOWSKA-DAWIDZIUK, A. 1995. Silurian retiolitids of the East European Platform. Acta Palaeontologica Polonica 40, 261-326.

KOZŁOWSKA-DAWIDZIUK, A. 2001. Phylogenetic relationships within the Retiolitidae (Graptolithina) and a new genus, Cometograptus. Lethaia 34, 84-96.View article

KOZŁOWSKA-DAWIDZIUK, A. 2004. Evolution of retiolitid graptolites - a synopsis. Acta Palaeontologica Polonica 49(4), 505-518.

KOZŁOWSKA-DAWIDZIUK A., LENZ, A.C. & BATES, D.E.B. 2003. A new classification of ancorate diplograptids, 565-569. In ORTEGA, G. & ACENOLAZA, G.F. (eds) Proceedings of the 7th International Graptolite Conference and Field Meeting of the International Subcommission on Silurian Stratigraphy. 549 pp. INSUGEO, Serie Correlación Geológica, Cumunicarte Editorial, Tucumán.

KOZŁOWSKI, R. 1938. Tymczasowe wiadomości o graptolitach z tremadoku polski i ich teoretycznym znaczeniu [Informations préliminaires sur les Graptolithes du Tremadoc de la Pologne et sur leur portée théorique]. Annales Musei Zoologici Polonici 13, 183-196.

KOZŁOWSKI, R. 1949. Les graptolithes et quelques nouveaux groups d’animaux du Trémadoc de la Pologne. Palaeontologia Polonica 3, 1-235.

KOZŁOWSKI, R. 1951 [often cited as 1952]. O niezwyklym graptolicie ordowickim. Acta Geologica Polonica 2(3), 291-299. [French translation: Sur un remarquable graptolite ordovicien. Acta Geologica Polonica 2, 86-93]

KOZŁOWSKI, R. 1954. O budowie nietorych Dichograptidae. Acta Geologica Polonica 4, 423-444. [French translation: Sur la structure de certain dichograptidés. Acta Palaeontologica Polonica 4, 118-135.]

KOZŁOWSKI, R. 1956. Nouvelles observations sur les Corynoididae (Graptolithina). Acta Palaeontologica Polonica 1(4), 259-269.

KOZŁOWSKI, R. 1959. Les hydroides ordoviciens a squelette chitineux. Acta Palaontologica Polonica 4(3), 209-271.

KOZŁOWSKI, R. 1960. Calyxdendrum graptoloides n. gen., n. sp. a graptolite intermediate between the Dendroidea and the Graptoloidea. Acta Palaeontologica Polonica 5(2), 107-125.

KOZŁOWSKI, R. 1961. Découverte d’un Rhabdopleuridé (Pterobranchia) ordovicien. Acta Palaeontologica Polonica 6(1), 3-16.

KOZŁOWSKI, R. 1962. Crustoidea - nouveau groupe de graptolites. Acta Palaeontologica Polonica 7(1-2), 3-52.

KOZŁOWSKI, R. 1963. Le dévelopmement d’un graptolite tuboide. Acta Palaeontologica Polonica 8(2), 103-134.

KOZŁOWSKI, R. 1966. Graptolodendrum mutabile n. gen., n. sp. - an aberrant dendroid graptolite. Acta Palaeontologica Polonica 11(1), 3-14.

KOZŁOWSKI, R. 1967. Sur certain fossiles ordoviciens a teste organique. Acta Palaeontologica Polonica 12(2), 99-132.

KOZŁOWSKI, R. 1970. Nouvelles observations sur les Rhabdopleuridés (Ptérobranches) ordoviciens. Acta Palaeontologica Polonica 15(1), 3-17.

KOZŁOWSKI, R. 1971. Early development stages and the mode of life of graptolites. Acta Palaeontologica Polonica 16(4), 313-341.

KRAFT, P. & KRAFT, J. 2003. Middle Ordovician graptolite fauna from Praha - Červený vrch (Prague Basin, Czech Republic). Bulletin of Geosciences 78(2), 129-139.

KRAFT, P. & KRAFT, J. 2008. Planktic dendroids - fiction or reality?, 10. In ŠTORCH, P. & KRAFT, P. (eds) Workshop on graptolite volume of Treatise on Invertebrate Paleontology and GWG meeting. 51 pp. Prague.

LACÉPEDE, B.G.E., 1801. Histoire naturelle des poissons 3. i-lxxi + 558 pp. Plassan, Paris.

LANKESTER, E.R. 1877. Notes on the embryology and classification of the animal kingdom; comprising a revision of speculations relative to the origin and significance of the germlayers. Quarterly Journal of Microscopical Science, New Series 17, 339-454.

LAPWORTH, C. 1873a. Notes on the British graptolites and their allies. 1. On an improved classification of the Rhabdophora, part 1. Geological Magazine 10, 500-504.View article

LAPWORTH, C. 1873b. Notes on the British graptolites and their allies. 1. On an improved classification of the Rhabdophora, part 2. Geological Magazine 10, 555-560.View article

LAPWORTH, C. 1876a. The Silurian System in the South of Scotland, 1-9. In ARMSTRONG, J., YOUNG, J. & ROBERTSON, D. (eds) Catalogue of the Western Scottish Fossils. Blackie & Son, Glasgow.

LAPWORTH, C. 1876b. On Scottish Monograptidae (concluded from page 507). Geological Magazine (decade II, vol. III) 13, 544-552.

LAPWORTH, C. 1879a. On the geological distribution of the Rhabdophora. Part I. Introduction. Annals and Magazine of Natural History, Series 5(3), 245-257.

LAPWORTH, C. 1879b. On the geological distribution of the Rhabdophora. Part I. Introduction (continued from p. 257). Annals and Magazine of Natural History, Series 5(3), 449-455.

LAPWORTH, C. 1879c. On the geological distribution of the Rhabdophora. Part II. Data (continued from vol. III, p. 455). Annals and Magazine of Natural History, Series 5(4), 333-341.

LAPWORTH, C. 1879d. On the geological distribution of the Rhabdophora. Part II. Data (continued from vol. IV, p. 341). Annals and Magazine of Natural History, Series 5(4), 423-431.

LAPWORTH, C. 1880a. On the geological distribution of the Rhabdophora. Part II. Data (continued from vol. IV, p. 431). Annals and Magazine of Natural History, Series 5(5), 45-62.

LAPWORTH, C. 1880b. On the geological distribution of the Rhabdophora. Part III. Results (continued from vol. V, p. 62). Annals and Magazine of Natural History, Series 5(5), 273-285.

LAPWORTH, C. 1880c. On the geological distribution of the Rhabdophora. Part III. Results (continued from vol. V, p. 285). Annals and Magazine of Natural History, Series 5(5), 358-369.

LAPWORTH, C. 1880d. On the geological distribution of the Rhabdophora. Part III. Results (continued from vol. V, p. 369). Annals and Magazine of Natural History, Series 5(6), 16-29.

LAPWORTH, C. 1880e. On the geological distribution of the Rhabdophora. Part III. Results (continued from vol. VI, p. 29). Annals and Magazine of Natural History, Series 5(6), 185-207.

LAPWORTH, C. 1880f. On new British graptolites. Annals and Magazine of Natural History 5(5), 149-177.View article

LAPWORTH, C. 1881. On the Cladophora (Hopk.) or Dendroid Graptolites collected by Professor Keeping in the Llandovery Rocks of Mid Wales. Quarterly Journal of the Geological Society of London 37, 171-177.View article

LEE, C.K. 1963. Some Middle Ordovician graptolites form Gueizhou. Acta Palaeontologica Sinica 11(4), 554-578.

LEGRAND, P. 1964. Un graptolite remarquable de l’Ordovicien inférieur du Sahara algérien, Choristograptus louhai nov. gen., nov. sp. Bulletin de la Société géologique de France 5(1), 52-57.

LEGRAND, P. 1987. Modo de desarrollo del suborden Diplograptina (Graptolithina) en el Ordovicico superior y en el Silurico. Implicaciones taxonomicas. Revista Espanola de Paleontología 2, 59-64.

LENZ, A.C. & KOZŁOWSKA, A. 2007. New and unusual upper Llandovery graptolites from Arctic Canada. Acta Palaeontologica Polonica 52(3), 489-502.

LENZ, A.C. & KOZŁOWSKA, A. 2010. Sagenograptoides, a new name for the retiolitid graptolite Sagenograptus Lenz and Kozłowska-Dawidziuk, 2001. Journal of Paleontology 84(19), 156.View article

LENZ, A.C. & KOZŁOWSKA-DAWIDZIUK, A. 2001. Upper Wenlock (Silurian) graptolites of Arctic Canada: pre-extinction lundgreni Biozone fauna. Palaeontographica Canadiana 20, 1-61.

LENZ, A.C. & MELCHIN, M.J. 1987. Silurian retiolitids from the Cape Phillips Formation, Arctic Islands, Canada. Bulletin of the Geological Society of Denmark 35, 161-170.

LENZ, A.C. & MELCHIN, M.J. 1997. Phylogenetic analysis of the Silurian Retiolitidae. Lethaia 29, 301-309.View article

LENZ, A.C., SENIOR, S., KOZŁOWSKA, A. & MELCHIN, M.J. 2012. Graptolites from the mid Wenlock (Silurian), Middle and Upper Sheinwoodian, Arctic Canada. Palaeontographica Canadiana 32, 1-93.

LEVINA, E.F. 1928. Graptolity iz Aq-Tengi v Turkestanskom chrebte. Trudy Srednie-aziatskogo gosudarstvennogo universiteta, Series 7a, Geologiya 5, 1-18. [in Russian]

LI, J.J. 1984. Some early Ordovician graptolites from Chongyi, Jiangxi. Acta Palaeontologica Sinica 23(5), 578-585.

LI, J.J. 1994. A revision of some early Ordovician graptolites of China, 61-71. In CHEN, X., ERDTMANN, B.-D. & NI, Y.N. (eds) Graptolite Research Today. 262 pp. Nanjing University Press, Nanjing.

LI, J.J. 1995. Lower Silurian graptolites from the Yangtze Gorge district. Palaeontologica Cathayana 6, 215-344.

LI, J.J. & GE, M.Y. 1981. Development and systematic position of akidograptids. Acta Palaeontologica Sinica 20, 225-234. [in Chinese with English abstract]

LI, J.J., GE, M.Y. & CHEN, X. 1987. Ordovician graptolites from Taishan, Guandong. Bulletin of Nanjing Institute of Geology and Palaeontology, Academia Sinica 12, 95-134.

LI, Z.M. & LI, D.Q. 1985. Appendispinograptus, a new subgenus of Climacograptus. Journal of the Wuhan College of Geology 10 (supplement), 35-42. [in Chinese with English summary]

LIN, Y.K. 1980. Ordosograptus - a new graptolite genus and its affinities. Acta Palaeontologica Sinica 19(6), 475-482.

LIN, Y.K. 1981. New materials of graptodendroids with special reference to the classification of Graptodendroidea. Bulletin of Nanjing Institute of Geology and Palaeontology, Academia Sinica 3, 242-262.

LIN, Y.K. 1986. A new planktonic graptolite fauna, 224-254. In CHEN, Y.J. (ed.) Aspects of Cambrian-Ordovician boundary in Dayangcha, China. China Prospect Publishing House, Beijing.

LINDHOLM, K. 1991. Ordovician graptolites from the early Hunneberg of southern Scandinavia. Palaeontology 34(2), 283-327.

LINDHOLM, K. & MALETZ, J. 1989. Intraspecific variation and relationships of some Lower Ordovician species of the dichograptid, Clonograptus. Palaeontology 32(4), 711-743.

LINNAUS, C. 1735. Systema natura, sive regna tria natura systematice proposita per classes, ordines, genera, and species. 12 pp. Lugduni Batavorum. (Haak). []

LINNAUS, C. 1758. Systema natura per regna tria natura, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. 824 pp. Salvius, Holmia.;

LINNAUS, C. 1768. Systema natura per regna tria natura, secundum classes, ordines, genera, species, cum characteribus and differentiis. Tomus III. 236 pp. Salvius, Holmia.

LODUCA, S.T. 1990. Medusaegraptus mirabilis as a noncalcified dasyclad alga. Journal of Paleontology 64, 469-474.

LOYDELL, D.K. 1991. The biostratigraphy and formational relationships of the upper Aeronian and lower Telychian (Llandovery, Silurian) formations of western mid-Wales. Geological Journal 26(3), 209-244.View article

LOYDELL, D.K. 1992. Upper Aeronian and Lower Telychian (Llandovery) graptolites from western Mid-Wales. Part 1. Monograph of the Palaeontographical Society of London 146(589), 1-55.

LOYDELL, D.K. 1993. Upper Aeronian and Lower Telychian (Llandovery) graptolites from western Mid-Wales, Part 2. Monograph of the Palaeontographical Society of London 147(592), 56-180.

LOYDELL, D.K. & MALETZ, J. 2004. The Silurian graptolite genera Streptograptus and Pseudostreptograptus. Journal of Systematic Palaeontology 2, 65-93.View article

LOYDELL, D.K. & NESTOR, V. 2006. Isolated graptolites from the Telychian (Upper Llandovery, Silurian) of Latvia and Estonia. Palaeontology 49(3), 585-619.View article

LUKASIK, J.J. & MELCHIN, M.J. 1994. Atavograptus primitivus (Li) from the earliest Silurian of Arctic Canada: Implications for monograptid evolution. Journal of Paleontology 68(5), 1159-1163.View article

LUKASIK, J.J. & MELCHIN, M.J. 1997. Morphology and classification of some early Silurian monograptids (Graptoloidea) from the Cape Phillips formation, Canadian Arctic Islands. Canadian Journal of Earth Sciences 34(8), 1128-1149.View article

M’COY, F. 1850. On some new genera and species of Silurian Radiata in the Collection of the University of Cambridge. Annals and Magazine of Natural History, Series 2(6), 270-290.

M’COY, F. 1876. On a new Victorian graptolite. Annals and Magazine of Natural History Series 4(18), 128-130.View article

M’INTOSH, W.C. 1882. Preliminary notice of Cephalodicus, a new type allied to Prof. Allman’s Rhabdopleura, dredged in H.M.S. ‘Challenger’. Annals and Magazine of Natural History (5th Series) 10, 337-348.

MALETZ, J. 1992. The proximal development in anisograptids (Graptoloidea, Anisograptidae). Paläontologische Zeitschrift 66(3/4), 297-309.View article

MALETZ, J. 1993. A possible abrograptid graptolite (Abrograptidae, Graptoloidea) from western Newfoundland. Paläontologische Zeitschrift 67(3/4), 323-329.View article

MALETZ, J. 1994a. Pendent Didymograptids (Graptoloidea, Dichograptina), 27-43. In CHEN X., ERDTMANN, B.-D. & NI, Y.N. (eds) Graptolite Research Today. 262 pp. Nanjing University Press, Nanjing.

MALETZ, J. 1994b. The rhabdosome architecture of Pterograptus (Graptoloidea, Dichograptidae). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 191(3), 345-356.

MALETZ, J. 1997. Graptolites from the Nicholsonograptus fasciculatus and Pterograptus elegans Zones (Abereiddian, Ordovician) of the Oslo Region, Norway. Greifswalder Geowissenschaftliche Beiträge 4, 5-100.

MALETZ, J. 1998. Undulograptus dicellograptoides n. sp., an abnormal diplograptid from the Late Arenig of western Newfoundland, Canada. Paläontologische Zeitschrift 72(1/2), 111-116.View article

MALETZ, J. 2001. Graptolite research in Germany [Hanns Bruno Geinitz Symposium]. Geologica Saxonica, Abhandlungen des Staatlichen Museums für Mineralogie und Geologie Dresden 46/47, 169-180.

MALETZ, J. 2004. Isolated Chewtonian (Lower Ordovician) graptolites from western Newfoundland. Paläontologische Zeitschrift 78(1), 173-187.View article

MALETZ, J. 2010. Xiphograptus and the evolution of virgella-bearing graptoloids. Palaeontology 53(2), 415-439.View article

MALETZ, J. 2011a. The identity of the Ordovician (Darriwilian) graptolite Fucoides dentatus Brongniart, 1828. Palaeontology 54(4), 851-865.View article

MALETZ, J. 2011b. Climacograptus pungens Ruedemann, 1904 and the definition of the Darriwilian (Ordovician) graptolite genus Archiclimacograptus Mitchell, 1987. Canadian Journal of Earth Sciences 48, 1355-1367.View article

MALETZ, J. 2011c. The proximal development of the Middle Ordovician graptolite Skanegraptus janus from the Krapperup drill core of Scania, Sweden. GFF 133, 49-56.View article

MALETZ, J. 2011d. Scandinavian isograptids (Graptolithina; Isograptidae): Biostratigraphy and Taxonomy. Proceedings of the Yorkshire Geological Society 58(4), 267-280.

MALETZ, J. 2014. Fossil Hemichordata (Pterobranchia, Enteropneusta). Palaeogeography, Palaeoclimatology, Palaeoecology 398, 16-27. View article

MALETZ, J., CARLUCCI, J. & MITCHELL, C.E. 2009. Graptoloid cladistics, taxonomy and phylogeny. Bulletin of Geosciences 84(1), 7-19.View article

MALETZ, J. & KOZŁOWSKA, A. 2013. Ordovician graptolites from the Yichang area, Hubei, China. Paläontologische Zeitschrift 87, 445-454. View article

MALETZ, J. & MITCHELL, C.E. 1996. Evolution and phylogenetic classification of the Glossograptidae and Arienigraptidae (Graptoloidea): new data and remaining questions. Journal of Paleontology 70(4), 641-655.View article

MALETZ, J. & SLOVACEK, M. 2013. Lower Ordovician (Dapingian) Baltograptus species (Graptolithina) in Dalarna, Sweden. Palaeontology 56(5), 1107-1120.View article

MALETZ, J., STEINER, M. & FATKA, O. 2005. Middle Cambrian pterobranchs and the question: What is a graptolite? Lethaia 38, 73-85.View article

MANCK, E. 1923. Untersilurische Graptolithenarten der Zone 10 des Obersilurs, ferner Diversograptus gen. nov. sowie einige neue Arten anderer Gattungen. Natur (Leipzig) 14, 282-289.

MATTHEW, G.F. 1886. Illustrations of the fauna of the St. John Group, III. Descriptions of new genera and species (including the description of a new species of Solenopleura by J.F. Whiteaves). Transactions of the Royal Society of Canada 3, 29-84.

MCKAY, B.D. & ZINK, R.M. 2010. The causes of mitochondrial DNA gene tree paraphyly in birds. Molecular Phylogenetic and Evolution 54, 647-650.View article

MCLEARN, F.H. 1915. The Lower Ordovician (Tetragraptus zone) at St. John, New Brunswick. American Journal of Science 40, 49-59.View article

MELCHIN, M.J. 1998. Morphology and phylogeny of some Early Silurian ‘diplograptid’ genera from Cornwallis island, Arctic Canada. Palaeontology 41, 263-315.

MELCHIN, M.J. 1999. Origin of the Retiolitidae: insights from a new graptolite genus from the early Silurian of Arctic Canada. Lethaia 32, 261-269.View article

MELCHIN, M.J., MITCHELL, C.E., NACZK-CAMERON, A., FAN, J.X. & LOXTON, J. 2011. Phylogeny and adaptive radiation of the Neograptina (Graptoloidea) during the Hirnantian mass extinction and Silurian recovery. Proceedings of the Yorkshire Geological Society 58(4), 281-309.View article

MIERZEJEWSKI, P. 1978. Tuboid graptolites from erratic boulders of Poland. Acta Palaeontologica Polonica 23(4), 557-475.

MIERZEJEWSKI, P. 1986a. Ultrastructure, taxonomy and affinities of some Ordovician and Silurian organic microfossils. Palaeontologia Polonica 47, 129-220.

MIERZEJEWSKI, P. 1986b. New aberrant sessile graptolites from glacial boulders. Acta Palaeontologica Polonica 30(3-4), 191-199.

MIERZEJEWSKI, P. 1991. Estoniocaulis Obut et Rotsk, 1958 and Rhadinograptus Obut, 1960 are not graptolites. Acta Palaeontologica Polonica 36(1), 77-81.

MIERZEJEWSKI, P. 2000. An aberrant encrusting graptolite from the Ordovician of Estonia. Acta Palaeontologica Polonica 45, 239-250.

MIERZEJEWSKI, P. 2001. A new graptolite intermediate between the Tuboidea and the Camaroidea. Acta Palaeontologica Polonica 46(3), 367-376.

MIKHAILOVA, N.F. 1975. Graptolity, 151-158. In MENNER, V.V. (ed.) Kharacteristika fauny progranichnych sloev silura i devona tsentralnogo Kazakhstana. Nedra, Moskva. [in Russian]

MILLER, S.A. 1874. Genus Megalograptus. The Cincinnati Quarterly Journal of Science 1, 343-346.

M’INTOSH, W.C. 1882. Preliminary notice of Cephalodicus, a new type allied to Prof. Allman’s Rhabdopleura, dredged in H.M.S. ‘Challenger’. Annals and Magazine of Natural History (5th Series) 10, 337-348.

M’INTOSH, W.C. 1887. Report on Cephalodiscus dodecalophus, M’Intosh, a new type of the Polyzoa, procured on the voyage of H.M.S. Challenger during the years 1873-76 (with an appendix, pp. 38-47, by S. Harmer on the anatomy of Cephalodiscus). Challenger Reports, Zoology 20, 1-47.

MITCHELL, C.E. 1987. Evolution and phylogenetic classification of the Diplograptacea. Palaeontology 30(2), 353-405.

MITCHELL, C.E. 1988. The morphology and ultrastructure of Brevigraptus quadrithecatus n. gen., n. sp. (Diplograptacea), and its convergence upon Dicaulograptus hystrix (Bulman). Journal of Paleontology 62(3), 448-463.

MITCHELL, C.E. 1994. Astogeny and rhabdosome architecture of graptolites of Undulograptus austrodentatus species group, 49-60. In CHEN, X., ERDTMANN, B.-D. & NI, Y.N. (eds) Graptolite Research Today. 262 pp. Nanjing University Press, Nanjing.

MITCHELL, C.E., GOLDMAN, D., KLOSTERMAN, S.L., MALETZ, J., SHEETS, H.D. & MELCHIN, M.J. 2007. Phylogeny of the Diplograptoidea. Acta Palaeontologica Sinica 46 (Suppl.), 332-339.

MITCHELL, C.E. & MALETZ, J. 1995. Proposal for adoption of the base of the Undulograptus austrodentatus Biozone as a global Ordovician stage and series boundary level. Lethaia 28, 317-331. View article

MITCHELL, C.E., MALETZ, J. & GOLDMAN, D. 2009. What is Diplograptus? Bulletin of Geosciences 84(1), 27-34.

MITCHELL, C.E., MALETZ, J. & ZHANG, Y.D. 1995. Evolutionary origins of the Diplograptina. The Pacific Section Society for Sedimentary Geology (SEPM), Book 77, 401-404.

MITCHELL, C.E. & MELCHIN, M.J. 2011. Graptolite phylogeny, disparity and taxa. Treatise Newsletter 2.2011, 33-39.

MITCHELL, C.E., MELCHIN, M.J., CAMERON, C.B. & MALETZ, J. 2010. Phylogeny of the tube-bearing Hemichordata reveals that Rhabdopleura is an extant graptolite. IPC3, Abstracts, 283.

MITCHELL, C.E., MELCHIN, M.J., CAMERON, C.B. & MALETZ, J. 2013. Phylogenetic analysis reveals that Rhabdopleura is an extant graptolite. Lethaia 46, 34-56.View article

MOBERG, J.C. 1892. Om nagra nya graptoliter fran Skanes Undre graptolitskiffer. Geologiska Föreningens i Stockholm Förhandlingar 14(4), 339-350.View article

MOBERG, J.C. & TÖRNQUIST, S.L. 1909. Retiolitoidea fran Skanes Colonusskiffer. Sveriges Geologiska Undersökning, Serie C 213, 1-20.

MONSCH, K.A. 2006. The PhyloCode, or alternative nomenclature: Why it is not beneficial to palaeontology, either. Acta Palaeontologica Polonica 51(3), 521-524.

MONSEN, A. 1925. Über eine neue ordovizische Graptolithenfauna. Norsk geologisk Tidsskrift 8, 147-187.

MONSEN, A. 1937. Die Graptolithenfauna im Unteren Didymograptus Schiefer (Phyllograptusschiefer) Norwegens. Norsk geologisk Tidsskrift 16(2-4), 57-267.

MU, A.T. 1950. [also: MU, E.Z.] On the evolution and classification of graptolites. Geological Review 15, 171-183. [in Chinese]

MU, A.T. 1955. On Spirograptus Gürich. Acta Palaeontologica Sinica 3(1), 6-10.

MU, A.T. 1957. Some new or little known graptolites from the Ningkuo Shale (Lower Ordovician) of Changshan, western Chekiang. Acta Palaeontologica Sinica 5(3), 369-437.

MU, A.T. 1958. Abrograptus, a new graptolite genus from the Hulo Shale (Middle Ordovician) of Kiangshan, western Chekiang. Acta Palaeontologica Sinica 6(3), 259-265.

MU, A.T. 1963a. Research into the graptolite faunas of Chilianshan. Scientia Sinica 12, 347-371.

MU, A.T. 1963b. On the complication of the graptolite rhabdosome. Acta Palaeontologica Sinica 11, 346-377. [in Chinese with English summary]

MU, A.T. 1974. Evolution, classification and distribution of Graptoloidea and graptodendroids. Scientia Sinica 17(2), 227-238.

MU, A.T. & CHEN, X. 1962. Sinodiversograptus multibrachiatus gen. et sp. nov. and its developmental stages. Acta Palaeontologica Sinica 10, 143-154.

MU, A.T. & CHEN, X. 1962. Graptolites of China. 171 pp. Science Press, Beijing. [in Chinese]

MU, A.T., GE, M.Y., CHEN, X., NI, Y.N. & LIN, Y.K. 1979. Lower Ordovician graptolites of southwest China. Palaeontologica Sinica (New Series B) 156(13), 1-192.

MU, A.T. & LEE, K.C. 1958. Scandent graptolites from the Ningkuo Shale of the Kiangshan-Changshan area, western Chekiang. Acta Palaeontologica Sinica 6, 391-427.

MU, A.T., LEE, C.K. & GEH, M.Y. 1960. Ordovician graptolites from Xinjiang (Sikiang). Acta Palaeontologica Sinica 8(1), 27-39.

MU, A.T., LEE, C.H., GEH, M.Y. & YIN, J.X. 1962. Graptolites from Chilianshan. Geology of Chilianshan 4. 168 pp. Science Press, Beijing.

MU, A.T., LI, J.J., GE, M.Y., CHEN, X., LIN, Y.K. & NI, Y.N. 1993. Upper Ordovician graptolites of Central China Region. Palaeontologia Sinica, New Series B, 189(29), 1-393. [in Chinese with English summary]

MU, A.T., LI, J.J., GE, M.Y., CHEN, X., NI, Y.N., LIN, Y.K. & MU, X. 1974. Graptolites, 154-164. In NIGPAS (ed.) A Handbook of the Stratigraphy and Palaeontology of Southwest China. 454 pp. Nanjing Institute of Geology and Palaeontology, Nanjing.

MU, A.T., LI, J., GE, M., LIN, Y. & NI, Y. 2002. Fossil Graptolites of China. XIV + 1205 pp. Nanjing University Press, Nanjing.

MU, A.T. & LIN, Y.K. 1984. Graptolites from the Ordovician- Silurian boundary sections of Yichang area, S. Hubei, 45-73. In NANJING INSTITUTE OF GEOLOGY AND PALAEONTOLOGY, ACADEMIA SINICA (ed.) Stratigraphy and palaeontology of systemic boundaries in China, Ordovician-Silurian boundary 1. 516 pp. Anhui Science and Technology Publishing House, Hefei.

MU, A.T. & NI, Y.N. 1975. Silurian and Devonian graptolites from the Qomolangma Feng Region. Report of Scientific Investigation in the Qomolangma Feng Region, Palaeontology 1, 1-27.

MU, A.T. & QIAO, X.D. 1962. New materials of Abrograptidae. Acta Palaeontologica Sinica 10(1), 1-8.

MUIR, L.A. 1999. A cladistic analysis of some Llandovery (Silurian) Monograptidae. 64 pp. Unpublished MSc. thesis, University of Bristol.

MUIR, L.A., ZHANG, Y.-D. & LIN, J.-P. 2013. New material from the Ordovician of China indicates that Inocaulis is a graptolite. Alcheringa 37, 565-566.View article

MÜNCH, A. 1931. Retiolites mancki, ein neuer Retiolites aus dem norddeutschen Geschiebe. XXIII Bericht Naturwissenschaftliche Gesellschaft Chemnitz, 35-42.

MURCHISON, R.I. 1867. Siluria. 4th edition (CARRUTHERS, W. 1867. Appendix D, 538-541). John Murray, London.

NI, Y.N. 1978. Lower Silurian graptolites from Yichang, western Hubei. Acta Palaeontologica Sinica 17(4), 387-416. [in Chinese with English abstract]

NI, Y.N. 1981. Two new graptolite genera from the Ningkuo Formation (Lower Ordovician) of Wuning, North Jiangxi. Geological Society of America Special Paper 187, 2103-2107.

NICHOLSON, H.A. 1867a. On some fossils from the Lower Silurian rocks of the south of Scotland. Geological Magazine 1(4), 107-113.

NICHOLSON, H.A. 1867b. On a new genus of graptolites, with notes on reproductive bodies. Geological Magazine 4, 256-263.View article

NICHOLSON, H.A. 1868. Notes on Helicograpsus, a new genus of graptolites. Annals and Magazine of Natural History, Series 4(2), 23-26. View article

NICHOLSON, H.A. 1869. On some new species of graptolites. Annals and Magazine of Natural History, London, Series 4(4), 231-242.View article

NICHOLSON, H.A. 1872a. A Manual of Palaeontology for the use of students with a general introduction on the Principles of Palaeontology. 601 pp. Blackwood & Sons, Edinburgh & London.

NICHOLSON, H.A. 1872b. A monograph of the British Graptolitidae. X + 133 pp. Blackwood & Sons, Edinburgh & London.

NICHOLSON, H.A. 1873. On some fossils from the Quebec Group of Point Lévis, Quebec. Annals and Magazine of Natural History, Series 4(11), 133-143.View article

NICHOLSON, H.A. 1875. On a new genus and some new species of graptolites from the Skiddaw Slates. Annals and Magazine of Natural History, Series 4(16), 269-273.View article

NICHOLSON, H.A. 1876. Notes on the correlation of the graptolitic deposits of Sweden with those of Britain. Geological Magazine 13, 245-249.View article

NINDEL, F. 1949. Undograptus nodosus nov. spec. von Raitzhain bei Ronneburg, Beitrag von Fr. Nindel aus Bärenwalds im Erzgebirge und Bemerkungen vom Verfasser, 24-25. In HUNDT, R. Zur Erforschung des Silurs Ostthüringens. Zweigniederlassung Gera: Geologischer Verein von Gera und Umgebung, Thüringer Volksverlag, Weimar.

NORDAL, I. & STEDJE, B. 2005. Paraphyletic taxa should be accepted. Taxon 54, 5-6.View article

NORMAN, A.M. 1869. Shetland Final Dredging Report. Part 2. On the Crustacea, Tunicata, Polyzoa, Echinodermata, Actinozoa, Hydrozoa and Porifera. Reports of the British Association of the Advancement of Science 38, 247-336.

NUTTING, C.C. 1905. Hydroids of the Hawaiian Islands collected by the steamer Albatross in 1902. Bulletin of the United States Fish Commission (for 1903) 23, 931-959.

OBRHEL, J. 1959. Ein Landpflanzenfund im mittelböhmischen Ordovizium. Geologie 8, 535-541.

OBUT, A.M. 1949. Polevoi atlas rukovodyashchikh graptolitov verkhnego silura Kirgizskoi SSR. 56 pp. Kirgizkii filial Akademii nauk SSSR, Geologicheskii institut, Frunze. [in Russian]

OBUT, A.M. 1950. Semeistva i nekotorye nody odnoryadnykh graptolitov. Voprosy paleontologii (Questions of Paleontology) 1, 264-272. [in Russian]

OBUT, A.M. 1953. Dendroidei severo-zapada Russkoj platformi. Trudy Vsesoyuznogo nepfhtyanovo nautchno-issledovatelskogo geologo-rasvedotchnogo instituta (VNIGRI), N.S. 78, 26-57. [in Russian]

OBUT, A.M. 1957. Klassifikatsiya i ukazatel rodov graptolitov. Ezhegodnik Vsesoyuznogo paleontologicheckogo obsehchectva 16, 11-47. [in Russian]

OBUT, A.M. 1960. Korrelyatsiya nekotorykh chastei razreza ordovikskikh i siluriiskikh otlozhenii Estonskoi SSR po graptolitam [Correlation on some parts of Estonian Ordovician and Silurian deposits according to graptolites]. Eesti NSV Teaduste Akadeemia, Geoloogia Instituudi Uurimused 5, 143-157. [in Russian]

OBUT, A.M. 1964. Podtip Stomochordata. Stomokhordovye, 279-337. In ORLOV, Y.A. (ed.) Osnovy paleontogii: Echinodermata, Hemichordata, Pogonophora, Chaetognatha. Nedra Press, Moscow. [in Russian]

OBUT, A.M. 1974. New graptolites from the Middle Cambrian of the Siberian Platform. Special Papers in Palaeontology 13, 9-13.

OBUT, A.M. 1987. Cochlograptus - a new genus of the Silurian graptolites. Trudy Instituta geologii i geofiziki (Novosibirsk) 388, 140-145.

OBUT, A.M. & RYTZK, G.V. 1958. Ordovikskie i siluriyskie dendroidei Estonii. Eesti NSV Geoloogia Instituudi Uurimused 3, 125-144. [in Russian]

OBUT, A.M. & SENNIKOV, N.V. 1984. Graptolites and zonal subdivisions Lower Ordovician of the Gorny Altai, 53-106. Academy of Sciences of the USSR, Siberian branch, Institute of Geology and Geophysics, Transactions 565, 1-122.

OBUT, A.M. & SENNIKOV, N.V. 1985. Osobennosti llandoveriyskich planktontovich soobschestv Sibirskoy Platformi [A pecularity of Llandovery planktic assemblages of the Siberian Platform], 51-60. In BETECHTUNA, O.A. & ZHURAVLEVA, I.T. (eds) Sreda i zhizn v geologicheskhom proshlom (paleobasseiny i ich obitateli). Trudy Instituta Geologii i Geofiziki, Nauka Publishing House, Novosibirsk 628. [in Russian]

OBUT, A.M. & SENNIKOV, N.V. 1987. Oepikograptus, peculiar genus of Middle Ordovician diplograptids (graptolites) [Translated from original Russian title]. Annual of the All-Union Paleontological Society, Leningrad 1987, “Nauka” Publishers, Leningrad Branch 30, 192-198. [in Russian]

OBUT, A.M. & SOBOLEVSKAYA, R.F. 1962. Problemy neftegazonosti Sovetskoi Arktiki: Paleontologiya i biostratigrafiya: Graptolity rannego ordovika na Taimyre. Trudy Nautchno-issledovatelskogo instituta geologii Arktiki 127(3), 65-85. [in Russian]

OBUT, A.M. & SOBOLEVSKAYA, R.F. 1964. Graptolity ordovika Taimyra. 91 pp. Nauka, Moskva. [in Russian]

OBUT, A.M. & SOBOLEVSKAYA, R.F. 1966. Graptolity rannego silura v Kazakhstane. 56 pp. Nauka, Moskva. [in Russian]

OBUT, A.M. & SOBOLEVSKAYA, R.F. 1967. Nekotorye stereostolonaty pozdnego kembriya i ordovika Noriľskogo rayona [Some stereostolonates of the late Cambrian and Ordovician of the Norilsk Region], 45-64. In IVANOVSKIY, A.B. & SOKOLOV, B.S. (eds) Novye dannye po biostratigrafii nizhnego paleozoya Sibirskoy platformy. Nauka, Moskva. [in Russian]

OBUT, A.M., SOBOLEVSKAYA, R.F. & MERKUREVA, A.P. 1968. Graptolity llandoveri v kernakh burovykh skvazhin Noriľskogo rayona. 137 pp. Nauka, Moskva. [in Russian]

OBUT, A.M. & ZASLAVSKAYA, N.M. 1976. New data on the early stages of Retiolitidae development, 119-127. In KALJO, D. & KOREN’, T.N. (eds) Graptolites and Stratigraphy. Academy of Sciences of Estonian SSR, Institute of Geology, Tallinn.

OBUT, A.M. & ZASLAVSKAYA, N.M. 1983. Semeyestva retiolitid i ikh filogeneticheskie otnosheniya [Retiolitid family and their phylogenetic relations], 103-113. In DAGYS, A.S. & DUBATOLOV, V.N. (eds) Morphologiya i sistematika bespozvonochnykh fanerozoya. Nauka, Moskva. [in Russian]

OBUT, A.M. & ZUBTZOV, E.I. 1964. Stratigraphy and graptolites from mountain range around the Narynskaya depression. Akademiya nauk SSR, Sibirskoe otdelenie, Institut geologii i geofiziki 10, 320.

ÖPIK, A.A. 1928. Beträge zur Kenntnis der Kukruse - (C2-C3) Stufe in Eesti. III. Acta et Commentationes Universitatis Tartuensis 13, 1-42.

ÖPIK, A.A. 1930. Beträge zur Kenntnis der Kukruse - (C2-C3) Stufe in Eesti. IV. Acta et Commentationes Universitatis Tartuensis 15, 1-34.

PADIAN, K., LINDBERG, D.R. & POLLY, P.D. 1994. Cladistics and the fossil record: the uses of history. Annual Review of Earth Planetary Science 22, 63-91.View article

PAGE, A., WILBY, P.R., MELLISH, C.J.T., WILLIAMS, M. & ZALASIEWICZ, J.A. 2009. Dawsonia Nicholson: linguliform brachiopods, crustacean tail-pieces and a problematicum rather than graptolite ovarian vesicules. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 99, 251-266.View article

PAŠKEVIČIUS, J. 1976. On some new Llandoverian diplograptids of the eastern Baltic, 140-151. In KALJO, D. & KOREN’, T.N. (eds) Graptolites and Stratigraphy. Academy of Sciences of Estonian SSR, Institute of Geology, Tallinn.

PAŠKEVIČIUS, J. 2011. The Ordovician and Silurian graptolites of Lithuania. 107 pp. Lambert Academic Publishing, Saarbrücken.

PETERSON, K.J., SU, Y.H., ARNONE, M.I., SWALLA, B. & KING, B.L. 2013. MicroRNAs support monophyly of enteropneust hemichordates. Journal of Experimental Zoology, Part B, Molecular and Developmental Evolution 9999, 1-7.View article

PIRAS, S. 2006. Valentinagraptus, a new genus of plectograptid graptoloid from the lower Ludlow (Silurian) of Barrandian, Bohemia. Geological Journal 41, 581-590.View article

POČTA, P. 1894. Systeme silurien du centre de la Boheme par Joachim Barrande. V Partie: Recherches Paléontologiques. Continuation éditée par le Musée Boheme. Vol. VIII Tome I". Bryozoaires. Hydrozoaires et partie des Anthozoaires. 230 pp. Published by the author, Prague.

POULSEN, C. 1924. Syrrhipidograptus Nathorsti, a new graptolite genus from the Ordovician of Bornholm. Meddelser fra Dansk geologisk Forening 6(25), 1-7.

POULSEN, C. 1937. On the Lower Ordovician faunas of east Greenland. Meddelelser om Groenland 119(3), 1-72.

POULSEN, C. 1943. Procyrtograptus garboi, a new graptolite from the Lower Silurian of Bornholm. Bulletin of the Geological Society of Denmark 10(3), 301-306.

PŘIBYL, A. 1941. Pernerograptus nov. gen. a jeho zástupci z českého a cizího siluru. [Pernerograptus nov. gen. und seine Vertreter aus dem böhmischen und ausländischen Silur]. Věstník Královské České společnosti nauk, Třída matematicko-přírodovědecká 1941, 1-19 [1-7, 15-18: in Czech; 8-14: in German].

PŘIBYL, A. 1943. Revision der Pristiograpten aus den Untergattungen Colonograptus n. subgen. und Saetograptus n. subg. Mitteilungen der Tschechischen Akademie der Wissenschaften 1942, 52(15), 1-22.

PŘIBYL, A. 1947. Classification of the genus Climacograptus Hall, 1865. Rozpravy České akademie věd a umění, Třída II (matematicko-přírodovědecká) 57(2), 1-10. [in Czech]

PŘIBYL, A. 1948a. Bibliographic index of Bohemian Silurian graptolites. Knihovna Státního geologického ústavu Republiky československé 22, 1-97.

PŘIBYL, A. 1948b. Some new subgenera of graptolites from the Families Dimorphograptidae and Diplograptidae. Věstník Státního geologického ústavu Československé republiky 23, 37-48.

PŘIBYL, A. 1949. Revision of the Diplograptidae and Glossograptidae of the Ordovician of Bohemia. Bulletin international de l’Académie tcheque des Sciences 50(1), 1-51.

PŘIBYL, A. 1967a. O rodu Bohemograptus gen. nov. (Graptoloidea) z českého a cizího ludlowu (Zur Gattung Bohemograptus gen. nov. (Graptolitoidea) aus dem böhmischen und fremden Ludlovium. Časopis Národního muzea, Oddíl přírodovědný 3, 133-136.

PŘIBYL, A. 1967b. Monograptus (Testograptus) subg. n. aus dem böhmischen und europäischen Silur. Věstník Ústředního ústavu geologického 42, 49-52.

PŘIBYL, A. 1981. New graptolites of the family Monograptidae from the Upper Silurian of Bohemia. Věstník Ústředního ústavu geologického 56, 371-375.

PŘIBYL, A. & ŠTORCH, P. 1983. Monograptus (Stimulograptus) subgen. n. (Graptolites) from the Lower Silurian of Bohemia. Věstnik Ústředního ústavu geologického 58(4), 221-225.

PŘIBYL, A. & ŠTORCH, P. 1985. Prochnygraptus gen. n. (Graptolithina, Monograptidae) from the middle and upper Llandovery of Europe. Věstník Ústředního ústavu geologického 60(2), 159-164.

RADZEVIČIUS, S. 2007. The genus Pristiograptus in Wenlock of East Baltic and the Holy Cross Mountains. Dissertationes Geologicae Universitatis Tartuensis 20, 1-57.

RICHTER, R. 1871. Aus dem thüringischen Schiefergebirge. Zeitschrift der Deutschen Geologischen Gesellschaft 23, 231-256.

RICKARDS, R.B. 1974. A new monograptid genus and the origin of the main monograptid genera. Special Papers in Palaeontology 13, 141-147.

RICKARDS, R.B. 1995. Crinitograptus, a new genus of Ludlow (Silurian) graptoloid. Journal of Paleontology 69(6), 1107-1111.View article

RICKARDS, R.B. & BULMAN, O.M.B. 1965. The development of Lasiograptus harknessi (Nicholson 1867). Palaeontology 8(2), 272-280.

RICKARDS, R.B. & CHAPMAN, A. 1991. Bendigonian graptolites (Hemichordata) of Victoria. Memoirs of the Museum of Victoria 52(1), 1-135.View article

RICKARDS, R.B. & DURMAN, P.N. 2006. Evolution of the earliest graptolites and other hemichordates, 5-92. In BASSETT, M.G. & DEISLER, V.K. (eds) Studies in Palaeozoic Palaeontology. Geological Series 25. National Museum of Wales, Cardiff.

RICKARDS, R.B., HUTT, J.E. & BERRY, W.B.N. 1977. Evolution of the Silurian and Devonian graptoloids. Bulletin of the British Museum (Natural History), Geology Series 28, 1-120.

RICKARDS, R.B. & JELL, J.S. 2002. New graptolite faunas from the Llandovery, lower Silurian of the Graveyard Creek Subprovince, Broken River region, Queensland, Australia. Proceedings of the Geologists’ Association 113, 111-120.View article

RICKARDS, R.B., PACKHAM, G.H., WRIGHT, A.J. & WILLIAMSON, P.L. 1995. Wenlock and Ludlow graptolite faunas and biostratigraphy of the Quarry Creek district, New South Wales. Association of Australasian Paleontologists, Memoir 17, 1-68.

RICKARDS, R.B. & WRIGHT, A.J. 1997. Graptolites of the Barnby Hills Shale (Silurian, Ludlow) New South Wales, Australia. Proceedings of the Yorkshire Geological Society 51(3), 209-227.View article

RICKARDS, R.B. & WRIGHT, A.J. 1999. Evolution of the Ludlow (Silurian) graptolite genus Bohemograptus Přibyl, 1936. Proceedings of the Yorkshire Geological Society 52(3), 313-320.View article

RICKARDS, R.B. & WRIGHT, A.J. 2004. Enigmagraptus n. gen., a new graptoloid (Pridoli, Silurian, New South Wales, Australia). Paläontologische Zeitschrift 78(1), 189-194.View article

RIDEWOOD, W.G. 1906. A new species of Cephalodiscus (C. gilchristi) from the Cape Seas. Marine Investigations in South Africa 4, 173-192.

RIGBY, J. 1986. A critique of graptolite classification, and a revision of the suborders Diplograptina and Monograptina. Geological Society Special Publication 20, 1-12.View article

RIVA, J.F. 1987. The graptolite Amplexograptus praetypicalis n. sp. and the origin of the typicalis group. Canadian Journal of Earth Sciences 24(5), 924-933.View article

RIVA, J.F. 1988. Graptolites at and below the Ordovician-Silurian boundary on Anticosti Island, Canada. Bulletin of the British Museum (Natural History) Geology 43, 221-237.

RIVA, J.F. 1992. The pendent sigmagraptine graptoloid Keblograptus bidens (Keble). Alcheringa 16, 315-319.View article

RIVA, J.F. 1994. Yutagraptus mantuanus Riva in Rickards 1994, a pendent xiphograptid from the Lower Ordovician of Utah, USA, 1-13. In CHEN, X., ERDTMANN, B.-D. & NI, Y.N. (eds) Graptolite research today. 262 pp. Nanjing University Press, Nanjing.

RIVA, J.F. & KETNER, K.B. 1989. Ordovician graptolites from the northern Sierra de Cobachi, Sonora, Mexico. Transactions of the Royal Society of Edinburgh, Earth Sciences 80, 71-90.View article

ROSELT, G. 1962. Über die ältesten Landpflanzen und eine mögliche Landpflanze aus dem Ludlow Sachsens. Geologie 2, 320-333.

ROSS, R.B. & BERRY, W.B.N. 1963. Ordovician graptolites of the Basin Ranges in California, Nevada, Utah and Idaho. U.S. Geological Survey Bulletin 1134, 1-177.

RUEDEMANN, R. 1895. Development and mode of growth of Diplograptus, McCoy. Fortieth Annual report of the New York State Geologist for the year 1894, 219-248.

RUEDEMANN, R. 1904. Graptolites of New York, Part 1. Graptolites of the Lower beds. New York State Museum Memoir 7, 1-803.

RUEDEMANN, R. 1908. Graptolites of New York, Part 2. New York State Museum Memoir 11, 1-583.

RUEDEMANN, R. 1916. Paleontologic contributions from the New York State Museum. New York State Museum Bulletin 189, 7-97.

RUEDEMANN, R. 1925. Some Silurian (Ontarian) faunas of New York. New York State Museum Bulletin 265, 1-134.

RUEDEMANN, R. 1933. The Cambrian of the Upper Mississippi Valley, Part III. Graptoloidea. Bulletin of the Public Museum of the City of Milwaukee 12(3), 307-348.

RUEDEMANN, R. 1936. Ordovician graptolites from Quebec and Tennessee. Journal of Paleontology 10(5), 385-387.

RUEDEMANN, R. 1937. A new North American graptolite faunule. American Journal of Science 233, 57-62.View article

RUEDEMANN, R. 1947. Graptolites of North America. Geological Society of America Memoir, 19, 1-652.View article

RUSCONI, C. 1948. Notas sobre fósiles ordovícicos y triásicos de Mendoza. Revista del Museo de Historia Natural de Mendoza 2, 245-254.

SADLER, P.M., COOPER, R.A. & MELCHIN, M.J. 2011. Sequencing the graptoloid clade: building a global diversity curve from local range charts, regional composites and global time-scale. Proceedings of the Yorkshire Geological Society 58(4), 329-343.View article

SALTER, J.W. 1858. On Graptopora, a new genus of Polyzoa alied to graptolites. Proceedings of the American Association of the Advancement of Science 11, 63-66.

SALTER, J.W. 1862. On Peltocaris, a new genus of Silurian Crustacea. Quarterly Journal of the Geological Society of London 18 (1-2), 347.View article

SALTER, J.W. 1863. Notes on the Skiddaw Slate Fossils. Quarterly Journal of the Geological Society of London 19, 135-140.

SARS, G.O. 1872. On some remarkable forms of animal life from the great deeps off the Norwegian coast I. Partly from posthumous manuscripts of the late Professor Dr. Michael Sars. University Programm for the 1st half-year 1869. 82 pp. Brogger and Bristiff, Christiania.

SARS, G.O. 1874. On Rhabdopleura mirabilis (M. Sars). Quarterly Journal of Microscopical Science, New Series 14, 23-44.

SARS, M. 1868. Fortsatte Bemarkninger over det dyriske livs udbredning i havets dybder. Sarskilt aftryt af Videnskabers-selskap forhandlinger for 1868, 245-275.View article

SATO, T. 1936. Vorläufige Mitteilung über Atubaria heterolopha gen. nov. sp. nov., einen in freiem Zustand aufgefundenen Pterobranchier aus dem Stillen Ozean. Zoologischer Anzeiger 115, 97-106.

SCHMIDT, W. 1939. Ein dendroider Graptolith aus dem Untersilur Thüringens. Beiträge zur Geologie von Thüringen 5(3), 121-126.

SCHRANK, F. VON PAULA 1802. Fauna Boica. Durchdachte Geschichte der in Baiern einheimischen und zahmen Thiere. Zweyter Band, Zweyte Abtheilung. 412 pp. Johann Wilhelm Krüll, Ingolstadt.

SDZUY, K. 1974. Mittelkambrische Graptolithen aus NW-Spanien. Paläontologische Zeitschrift 48(1-2), 110-139.View article

SEDGWICK, A. & MCCOY, F. [M’COY, F.] 1855. Synopsis of the Classification of the British Palaeozoic Rocks (by the Rev. Adam Sedgwick, M.A. F.R.S.) with a systematic description of the British Palaeozoic Fossils in the Geological Museum of the University of Cambridge (by Frederick McCoy, F.G.S. Hon. F.C.P.S.). I-XCVIII + 661 pp. John W. Parker & Son, West Strand; Deighton, Bell & Co. & MacMillan & Co, Cambridge. [2 volumes; I: text; II: plates; originally published in 3 instalments, 1851, 1852, 1854]

SEILACHER, A. & SEILACHER, E. 1994. Bivalvian trace fossils: a lesson from actuopaleontology. Courier Forschung Senckenberg 169, 5-15.

SENNIKOV, N.V. 1976. Graptolity i stratigrafiya nizhnego silura Altaya [Graptolites and stratigraphy of the Lower Silurian of the Altai]. Trudy Instituta geologii i geofiziki, Akademiya nauk SSSR, Sibirskoe otdelenie 304, 1-230. [in Russian]

SENNIKOV, N.V. 1984. Nekotorye retiolitidy (graptolity) gornogo Altaya [Some retiolitids (graptolites) of the Altai Mountains]. Trudy Instituta geologii i geofiziki, Akademiya nauk SSSR, Sibirskoe otdelenie 584, 48-55. [in Russian]

SENNIKOV, N.V. 1998. New graptolite taxa from the Middle Cambrian to Ordovician of central Siberia. News of Paleontology and Stratigraphy. Supplement to journal Geologiya i geofizika 1, 15-32. [in Russian]

SEPKOWSKI JR., J.J. 1979. A kinetic model of Phanerozoic taxonomic diversity II. Early Phanerozoic families and multiple equilibria. Paleobiology 5(3), 222-251.

SKEVINGTON, D. 1963. Graptolites from the Ontikan Limestones (Ordovican) of Öland, Sweden. I: Dendroidea, Tuboidea, Camaroidea, and Stolonoidea. The Bulletin of the Geological Institutions of the University of Uppsala 42, 1-62.

SHERWIN, L. & RICKARDS, R.B. 2000. Rogercooperia, a new genus of Ordovician glossograptid graptolites from southern Scotland and New South Wales, Australia. Scottish Journal of Geology 36, 159-164.View article

SKEVINGTON, D. 1965. Graptolites from the Ontikan Limestones (Ordovician) of Öland, Sweden. II: Graptoloidea and Graptovermida. Publications from the Palaeontological Institution of the University of Uppsala 63, 1-73.

SKOGLUND, R. 1961. Kinnegraptus, a new graptolite genus from the Lower Didymograptus Shale of Västergötland, central Sweden. Bulletin of the Geological Institute of the University of Uppsala 40, 389-400.

SKWARKO, S.K. 1968. Some Ordovician graptolites from the Canning Basin, western Australia. 1. On the structure of Didymograptus artus Elles and Wood. Bulletin of the Bureau of Mineral Resources, Geology and Geophysics of Australia 92, 171-190.

SKWARKO, S.K. 1974. Some graptolites from the Canning Basin, western Australia 2. Graptolites from the Goldwyer No. 1 well. Bulletin of the Bureau of Mineral Resources, Geology and Geophysics of Australia 150, 43-56.

SNELLING, A.M. & ZALASIEWICZ, J.A. 2011. The evolutionary lineage of Petalolithus to Cephalograptus: evidence from Coalpit Bay, Northern Ireland. Proceedings of the Yorkshire Geological Society 58, 345-350.View article

SOSEF, M.S.M. 1997. Hierarchical models, reticulate evolution and the inevitability of paraphyletic supraspecific taxa. Taxon 46(1), 75-85.View article

SPENCER, J.W. 1878. Graptolites from the Niagara Formation. Canadian Naturalist and Geologist 8, 457-463.

SPENCER, J.W. 1883. Occurrence of graptolites in the Niagara Formation of Canada. Proceedings of the American Association for the Advancement of Science 31, 363-365.

SPENGEL, J.W. 1932. Planctosphaera. Report on the scientific results of the “Michael Sars” North Atlantic Deep-Sea Expedition 1910, Vol. 5, 590-600.

SPJELDNAES, N. 1963. Some Upper Tremadocian graptolites from Norway. Palaeontology 6(1), 121-131.

STEINER, M. & MALETZ, J. 2012. Cambrian graptolites (Pterobranchia) and the origin of colonial organization in metazoans. Terra Nostra 3, 173-174.

STEWART, S. & MITCHELL, C.E. 1997. Anticostia, a distinctive new Late Ordovician “glyptograptid” (Diplograptacea, Graptoloidea) based on three-dimensionally preserved specimens from Anticosti Island, Quebec. Canadian Journal of Earth Sciences 34(2), 215-228.View article

ŠTORCH, P. 1998a. New data on Telychian (Upper Llandovery, Silurian) graptolites from Spain. Journal of the Czech Geological Society 43, 113-142.

ŠTORCH, P. 1998b. Graptolites of the Pribylograptus leptotheca and Lituigraptus convolutus biozones of Tmaň (Silurian, Czech Republic). Journal of the Czech Geological Society 43(3), 209-272.

ŠTORCH, P., MITCHELL, C.E., FINNEY, S.C. & MELCHIN, M.J. 2011. Uppermost Ordovician (upper Katian - Hirnantian) graptolites of north-central Nevada, U.S.A. Bulletin of Geosciences 86(2), 301-386.View article

ŠTORCH, P. & SERPAGLI, E. 1993. Lower Silurian graptolites from Southwestern Sardinia. Bollettino della Societa Paleontologica Italiana 32, 3-57.

STRACHAN, I. 1954. The structure and development of Peiragraptus fallax, gen. et sp. nov. A new graptolite from the Ordovician of Canada. Geological Magazine 41(6), 509-513.View article

STRACHAN, I. 1985. The significance of the proximal end of Cryptograptus tricornis (Carruthers) (Graptolithina). Geological Magazine 122(2), 151-155.View article

STRACHAN, I. 1990. A new genus of abrograptid graptolite from the Ordovician of Southern Scotland. Palaeontology 33(4), 933-936.

SUDBURY, M. 1958. Triangulate monograptids from the Monograptus gregarius zone (Lower Llandovery) of the Rheidol Gorge (Cardiganshire). Philosophical Transactions of the Royal Society of London, Series B 241(685), 485-554.View article

SUESS, E. 1851. Über böhmische Graptolithen. Naturwissenschaftliche Abhandlungen von W. Haidinger 4(4), 87-134.

SWALLA, B.J. & SMITH, A.B. 2008. Deciphering deuterostome phylogeny: molecular, morphological and palaeontological perspectives. Philosophical Transactions of the Royal Society B 363, 1557-1568.View article

TERMIER, H. & TERMIER, G. 1948. Les graptolithes dendroides en Afrique du nord. Compte rendu sommaire des séances de la Société géologique de France 9, 174-176.

THOMAS, D.E. 1972. Two new graptolites from Victoria, Australia. Geological Magazine 109(6), 529-532.View article

TINN, O., MEIDLA, T., AINSAAR, L. & PANI, T. 2009. Thallophytic algal flora from a new Silurian Lagerstätte. Estonian Journal of Earth Sciences 58, 38-42.View article

TÖRNQUIST, S.L. 1865. Om Fagelsangstraktens Undersiluriska lager. Geologiska Iakttagelser. Lunds Universitets arsskrift 1, 1-24.

TÖRNQUIST, S.L. 1901. Researches into the graptolites of the lower zones of the Scanian and Vestrogothian Phyllo-Tetragraptus beds, Part 1. Lunds Universitets arsskrift 37(2), 1-26.

TÖRNQUIST, S.V. 1904. Researches into the Graptolites of the Lower Zones of the Scanian and Vestrogothian Phyllo-Tetragraptus beds 2. Lunds Universitets arsskrift 40, Afdeln. 2(2), 1-29.

TSEGELNIUK, P.D. 1976. Late Silurian and early Devonian monograptids from the south-western margin of the East European Platform, 91-133. In SHULGA, P.L. (ed.) Palaeontology and Stratigraphy of the Upper Precambrian and Lower Paleozoic of the South-West part of the east European Platform. Naukova dumka, Kiev. [in Russian]

TSEGELNIUK, P.D. 1998. Problems in the evolution of the Silurian Uncinatograptinae and their stratigraphic value. Temas Geologico-Mineros ITGE 23, 271-273.

TULLBERG, S.A. 1880. Tvenne nya graptolitslägten. Geologiska Föreningens i Stockholm Förhandlingar 5(7), 313-316.View article

TULLBERG, S.A. 1883. Skanes Graptoliter II. Graptolitfaunorna I Cardiolaskiffern och Cyrtograptusskiffern. Sveriges Geologiska Undersökning, Serie C, Afhandlingar och Upsatser 55, 1-43.

TZAJ, D.T. (TSAY, D.T.) 1969. A new Ordovician genus Acrograptus. Paleontological Journal 1, 133-134.

TZAJ, D.T. (TSAY, D.T.) 1973. Novyy ordovikskiy rod Kstaugraptus Tzaj gen. nov. Trudy Instituta geologii i geofiziki (Novosibirsk) 47, 5-6. [in Russian]

URBANEK, A. 1954. Some observations on the morphology of Monograptidae. Acta Geologica Polonica 4, 291-306.

URBANEK, A. 1958. Monograptidae from erratic boulders of Poland. Acta Palaeontologica Polonica 9, 1-105.

URBANEK, A. 1963. On generation and regeneration of cladia in some Upper Silurian monograptids. Acta Palaeontologica Polonica 8(2), 135-254.

URBANEK, A. 1966. On the morphology and evolution of the Cucullograptinae (Monograptidae, Graptolithina). Acta Palaeontologica Polonica 11(3/4), 291-544.

URBANEK, A. 1970. Neocucullograptinae n. subfam. (Graptolithina) - their evolutionary and stratigraphic bearing. Acta Palaeontologica Polonica 15(2/3), 163-388.

URBANEK, A. 1986. The enigma of graptolite ancestry: lesson from a phylogenetic debate, 184-226. In HOFFMAN, A. & NITECKI, M. (eds) Enigmatic Fossil Taxa. Oxford University Press, Oxford.

URBANEK, A. 1997. Late Ludfordian and arly Pridoli monograptids from the Polish lowland. Palaeontologia Polonica 56, 87-231.

URBANEK, A., RADZEVIČIUS, S., KOZŁOWSKA, A. & TELLER, L. 2012. Phyletic evolution and iterative speciation in the persistent Pristiograptus dubius lineage. Acta Palaeontologica Polonica 57(3), 589-611.View article

VAN PHUC, N. 1998. Vietnamograptus: a new diplograptid genus from the Monograptus hercynicus zone of the Muongxen area, northwest part of Central Vietnam. Temas Geológico-Mineros 23, 286.

WALCOTT, C.D. 1919. Middle Cambrian algae. Smithsonian Miscellaneous collections 67(5), 217-260.

WANG, X.F. 1977. The discovery of the latest Silurian and early Devonian monograptids from Qinzhou, Guangxi, and its significance. Acta Geologica Sinica 1977, 190-205.

WANG, X.F., JIN, Y.Q., WU, Z.T., FU, H.Y., LI, Z.C. & MA, G.G. (eds) 1977. Graptolites of Central-South China. In Handbook to Palaeontology of central-south China. Pt 1. Early Palaeozoic Era. Geological Publishing House, Beijing. [in Chinese]

WANG, X.F. & WANG, C. 2001. Tremadocian (Ordovician) graptolite diversification events in China. Alcheringa 25(2), 155-168.View article

WESTERGARD , A.H. 1909. Studier öfver Dictyograptus-skiffern och dess Gränslager Meddelingens om Lunds Geologiska Fältsklubb, Series B4, 1-98.

WHITFIELD, R.P. 1902. Notice of a new genus of marine alga, fossil in the Niagara Shale. American Museum of Natural History, Bulletin 16, 399-400.

WHITTINGTON, H.B. 1954. A new Ordovician graptolite from Oklahoma. Journal of Paleontology 28(5), 613-621.

WHITTINGTON, H.B. 1955. Additional new Ordovician graptolites and a chitinozoan from Oklahoma. Journal of Paleontology 29(5), 837-851.

WILLIAMS, S.H. 1992. Lower Ordovician (Arenig-Llanvirn) graptolites from the Notre Dame Subzone, central Newfoundland. Canadian Journal of Earth Sciences 29(8), 1717-1733.View article

WILLIAMS, S.H. & STEVENS, R.K. 1988. Early Ordovician (Arenig) graptolites of the Cow Head Group, western Newfoundland, Canada. Palaeontographica Canadiana 5, 1-167.

WILLIAMS, S.H. & STEVENS, R.K. 1991. Late Tremadoc graptolites from western Newfoundland. Palaeontology 34 (1), 1-47.

WIMAN, C. 1901. Über die Borkholmer Schicht im Mittelbaltischen Silurgebiet. Bulletin of the Geological Institutions of the University of Uppsala 5, 151-222.

WINCHELL, C.J., SULLIVAN, J., CAMERON, C.B. SWALLA, B.J. & MALLATT, J. 2002. Evaluating hypotheses of deuterostome phylogeny and chordate evolution with new LSU and SSU ribosomal DNA data. Molecular Biology and Evolution 19(5), 762-776.View article

WORSAAE, K., STERRER, W., KAUL-STREHLOW, S., HAY-SCHMIDT, A. & GIRIBET, G. 2012. An anatomical description of a miniaturized acron worm (Hemichordata, Enteropneusta) with asexual reproduction by paratomy. PLOS One 7(11), 1-19.View article

XIAO, C.X. & CHEN, H. 1990. Some graptolite faunas of the Lower and Middle Ordovician from Gucheng area, Yushan. Geology of Jiangxi 4(2), 83-243.

XIAO, C.X., XIA, T.L. & WANG, Z.Y. 1985. New materials of Cardiograptidae from S. Jiangxi and their evolutionary relationship. Acta Palaeontologica Sinica 24(4), 429-439.

YAKOVLEVA, N.N. (YAKOVLEV, N.N.) 1933. Planktonyj graptolit iz Kazakhstana [A planktonic graptolite from Kazakhstan]. Izvestia Akademii nauk SSSR, Otdelenie matematicheskikh i estestvennykh nauk, 979-981. [in Russian]

YANG, D.Q., NI, Y.N., LI, J.J., CHEN, X., LIN, Y.K., YU, J.H., XIA, G.S., JIAO, S.D., FANG, Y.T., GE, M.Y. & MU, E.Z. 1983. Hemichordata, 353-508. In NANJING INSTITUTE OF GEOLOGY AND MINERAL RESOURCES (ed.) Palaeontological Atlas of East China. Geological Publishing House, Beijing.

YIN, T.H. 1937. Brief description of the Ordovician and Silurian fossils from Shihtien. Bulletin of the Geological Society of China 16, 281-302.View article

YU, J.H. 1962. Graptolites (Ptilograptidae) from West Yunnan. Bulletin of Nanjing University (Geology) 2, 47-54.

YU, J.H. & FANG, Y.T. 1966. The discovery of graptolites with folded thecae from the Hulo Shale of the Xiushui (Siushui) drainage basin, Jiangxi (Kiangsi). Acta Palaeontologica Sinica 14(1), 92-97.

YU, J.H. & FANG, Y.T. 1979. On the classification of graptoloids. Acta Palaeontologica Sinica 18(5), 435-443.

YU, J.H. & FANG, Y.T. 1981. Arienigraptus, a new genus from the Ningkuo Formation (Lower Ordovician) of south China. Acta Palaeontologica Sinica 20, 27-32.

ZALASIEWICZ, J. & HOWE, M.P.A. 2003. A case of profound astogenetic metamorphosis: the structure and affinities of Awarograptus nodifer (Törnquist, 1881). Scottish Journal of Geology 39(1), 45-49.View article

ZANDER, R.H. 2007. Paraphyly and the species concept, a reply to Ebach et al. Taxon 56(3), 642-644.View article

ZESSIN, W. & PUTTKAMER, K., FREIHERR VON 1994. Melanostrophus fokini Öpik (Graptolithina, Stolonoidea) - Fund einer vollständigen Kolonie in einem ordovizischen Geschiebe von Rendsburg, Schleswig-Holstein. Archiv für Geschiebekunde 1(10), 563-572.

ZHAO, X. & ZHANG, S. 1985. Reclined graptolites of the Xinchangian. Journal of Changchun College of Geology 2(40), 13-26.

ZHAO, Y.T. 1964. A new multiramous graptolite from Ningkuo Shale of Zhejiang. Acta Palaeontologica Sinica 12(4), 638-641.

ZHAO, Y.T. 1984. A new genus - Sichuanograptus gen. nov. from the Lower Silurian of Nanjiang. Sichuan Province. Professional papers in Stratigraphy and Palaeontology 11, 97.

ZHAO, Y.T. 1984. On the evolution of monograptids based on the contraction of the thecal apertural margin. Acta Geologica Sinica 58(2), 97-105. [in Chinese with English abstract]