Sibling echinoderm taxa on isolated Ordovician continents: Problem of center of origin

 

Authors: Rozhnov SV

Published in: Bulletin of Geosciences, volume 85, issue 4; pages: 671 - 678; Received 1 February 2010; Accepted in revised form 6 September 2010; Online 30 November 2010

Keywords: Ordovician, echinoderms, sibling taxa, biogeography, Baltica, Laurentia, Gondwana,

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Abstract

Morphologically similar echinoderm genera are mostly known from the Ordovician of two isolated continents, Baltica and Laurentia, although these landmasses were strictly isolated biogeographically by the Iapetus Ocean and had different climates during the Early and Middle Ordovician. The morphological characters of most of these echinoderm genera exclude the possibility that Baltic genera evolved from Laurentian forms or vice versa and suggest that their common ancestral group was from a different region. I proposed to name such genera ‘sibling genera’, or twin genera by analogy with sibling species. Eocrinoid sibling genera are representatives of the cryptocrinitid-rhipidocystid clade. Baltic Paracryptocrinites and Cryptocrinites are sibling genera of Laurentian Columbocystis, Springerocystis and Foerstecystis, Baltic Rhipidocystis is a sibling genus of Laurentian Mandalacystis and Baltic Neorhipidocystis is sibling genus of Laurentian Batherocystis. It is assumed that North American platicystid paracrinoids, cryptocrinid and rhipidocystid eocrinoids evolved from a common ancestral eocrinoid, similar to Paracryptocrinites. Sibling genera are also known among other Ordovician echinoderms, for example, crinoids (hybocrinids), edrioasteroids (edrioblastoids) and rhombiferans. Some genera migrated from Baltica to Laurentia and vice versa. The temperate warm water seas of eastern Gondwana in the northern China-Australian region were a possible biogeographical center of origin, diversification or distribution of Laurentian and Baltic sibling genera. Biogeographical analysis of Baltic echinoderms shows that the Baltic Region could be viewed as a ‘museum’ or ‘storehouse’ for many of them, they immigrated and survived there for some considerable time, rather then a ‘cradle’, where they arose and from where they migrated to other continents.

References

Arendt, Y.A. 1976. Ordovician Hemistreptocrinoid Echinoderms. Byulletin Moskovskogo obtchestva ispytateley prirody, Otdel geologitcheskiy 51(2), 63–84. [in Russian]

Arendt, Y.A. 1985. The earliest trimerous crinoids lacking pentamerous symmetry. Doklady Akademii Nauk SSSR 282(3), 702–704. [in Russian]

Arendt, Y.A. & Rozhnov, S.V. 1995. Concerning Hemistreptocrinoids. Paleontological Zhurnal 29(1), 161–166.

Briggs, J.C. 2007. Marine longitudinal biodiversity: causes and conservation. Diversity and Distributions 13, 544–555.View article

Christiansen, J.L. & Stouge, S. 1999. Using palaeo-oceanographical modeling in reconstructing Early Ordovician palaeogeography. Acta Universitatis Carolinae 43(1/2), 515–518.

Cocks, L.R.M. & Torsvik, T.H. 2002. Earth geography from 500 to 400 million years ago: a faunal and palaeomagnetic review. Journal of the Geological Society 159, 631–644.View article

Cocks, L.R.M. & Torsvik, T.H. 2005. Baltica from the late Precambrian to mid-Paleozoic times: The gain and loss of terrane’s identity. Earth-Science Reviews 72, 39–66.View article

Cocks, L.R.M. & Torsvik, T.H. 2007. Siberia, the wandering northern terrane, and its changing geography through the Palaeozoic. Earth-Science Reviews 82, 29–74.View article

Cope, J.C.W. 1988. A reinterpretation of the Arenig crinoid Ramseyocrinus. Palaeontology 31(1), 229–235.

Dronov, A.V. & Rozhnov, S.V. 2007. Climatic changes in the Baltoscandian basin during the Ordovician: sedimentological and palaeontological aspects. Acta Palaeontologica Sinica 46, Suppl., 108–113.

Guensburg, T.E. & Sprinkle, J. 1994. Revised phylogeny and functional interpretation of the Edrioasteroidea based on new taxa from the Early and Middle Ordovician of Western Utah. Fieldiana (Geology), New Series 29, 1–43.

Haude, R. 1972. Bau und Funktion der Scyphocrinites-Lobolithen. Lethaia 5, 95–125.View article

Holland, N.D. 1991. Echinodermata: Crinoidea, 247–299. In Giese, A.C., Pearse, J.C. & Pearse, V.B. (eds) Reproduction of Marine Invertebrates, Volume VI. Echinoderms and Lophophorates. The Boxwood Press, Pacific Grove, California.

Ivanova-Kasas, O.M. 1978. Comparative embryology of invertebrate animals. Echinodermata and Hemichordata. Nauka Press, Moscow. [in Russian]

Lefebvre, B. & Fatka, O. 2003. Palaeogeographical and palaeoecological aspects of the Cambro-Ordovician radiation of echinoderms in Gondwanan Africa and peri-Gondwanan Europe. Palaeogeography, Palaeoclimatology, Palaeoecology 195, 73–97.View article

Lewis, R.D., Sprinkle, J., Bailey, J.B.,Moffit, J. & Parsley, R.L. 1987. Mandalacystis, a new rhipidocystid eocrinoid from the Whiterockian stage (Ordovician) in Oklahoma and Nevada. Journal of Paleontology 60(6), 1222–1235.View article

Mayr, E. 1942. Systematics and the origin of species. xiv + 334 pp. Columbia University Press, New York.

Parsley, R.L. 1975. Systematics and functional morphology of Columbocystis, a Middle Ordovician “Cystidean” (Echinodermata) of uncertain affinities. Bulletin of American Paleontology 67(287), 349–360.

Parsley, R.L. & Mintz, L.W. 1975. North American Paracrinoidea: (Ordovician: Paracrinozoa, new, Echinodermata). Bulletin of American Paleontology 68(288), 1–115.

Reed, F.R.C. 1917. Ordovician and Silurian fossils from Yun-Nan. Memoirs of the Geological Survey of India. Palaeontologia Indica, New Series VI(3), 1–69.

Rozhnov, S.V. 1985. Morphology, symmetry, and systematic position of Hybocrinida (Crinoidea). Paleontological Journal 2, 1–13.

Rozhnov, S.V. 1988. The morphology and systematic position of Lower Ordovician sea lilies. Paleontological Journal 22(2), 62–75.

Rozhnov, S.V. 1989. New data on rhipidocystids (Eocrinoidea), 38–57. In Kaljo, D.L. (ed.) Problems in the Study of Fossil and Modern Echinoderms. Tallinn. [in Russian]

Rozhnov, S.V. 1994. Comparative morphology of Rhipidocystis Jaekel, 1900 and Cryptocrinites von Buch, 1840 (Eocrinoidea, Ordovician), 173–178. In David, B., Guille, A., Féral, J.-P. & Roux, M. (eds) Echinoderms through Time: Proceedings of 8th International Echinoderm Conference Dijon France, 1993. A.A. Balkema, Rotterdam.

Rozhnov, S.V. 1998. Crookedness of the stem and crown of pelmatozoan echinoderms as resulting from different kinds of heterochrony, 385–390. In Candia Carnevali, M.D. & Bonasoro, F. (eds) Echinoderm Research 1998: Proceedings of the fifth European Conference on Echinoderms, Milan, Italy, 1998. A.A. Balkema, Rotterdam.

Rozhnov, S.V. 2002. Morphogenesis and evolution of crinoids and other pelmatozoan echinoderms in the Early Paleozoic. Paleontological Journal 36, Suppl. 6, S525–S674.

Rozhnov, S.V. 2007a. Origin of Echinoderms in the Palaeozoic Evolutionary Fauna: Ecological Aspects. Acta Palaeontologica Sinica 46, Suppl., 416–421.

Rozhnov, S.V. 2007b. Vicarious Echinoderm Taxa on the Separated Ordovician Continents: Problem of Origin. Abstracts 1st International Palaeobiogeography Symposium. Paris.

Rozhnov, S.V. 2007c. Changes in the Early Paleozoic geography as a possible factor of echinoderm higher taxa formation: Delayed larval development to cross the Iapetus Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology 245, 306–316.View article

Rozhnov, S.V. 2007d. New data on perittocrinids and hybocrinids (Crinoidea, Echinodermata) from the Middle Ordovician of the Baltic Region. Annales de Paleontologie 93(4), 261–276.View article

Rozhnov, S.V. 2009a. Eocrinoids and paracrinoids of the Baltic Ordovician basin: a biogeographical aspect. Absolutely final meeting of IGC P503: Ordovician palaeogeography and palaeoclimat, Copenhagen 2009, Abstracts, 16.

Rozhnov, S.V. 2009b. The role of heterochrony in the establishment of the body plan of higher echinoderm taxa. Biology Bulletin 36(2), 117–127.View article

Rozhnov, S.V. & Fedorov, P.V. 2001. A new cryptocrinid genus (Eocrinoidea, Echinodermata) from the bioherm-related facies of the Volkhov Stage (Late Arenigian, Ordovician), Leningrad Region. Paleontological Journal 35(6), 606–613.

Rozhnov, S.V. & Kushlina, V.B. 1994. A new interpretation of Bolboporites (Echinodermata, ?Eocrinoidea). Paleontological Journal 2, 59–65.

Rozhnov, S.V., Minjin, C. & Kushlina, V.B. 2009. Discovery of Rhombifera (Echinoderms) in the Ordovician of Mongolia. Paleontological Journal 43(11), 1425–1431.View article

Smith, A.B. 1997. Echinoderm larvae and phylogeny. Annual Reviews of Ecology and Systematics, 28, 219–241.View article

Sprinkle, J. 1973. Morphology and evolution of blastozoan echinoderms. Harvard Museum of Comparative Zoology Special Publication.View article

Sprinkle, J. & Guensburg, T.E. 2004. Crinozoan, blastozoan, echinozoan, asterozoan, and homalozoan echinoderms, 266–280. In Webby, B.D., Paris, F., Droser, M.L. & Percival, I.G. (eds) The Great Ordovician Biodiversification Event. Columbia University Press, New York.View article

Sprinkle, J. & Moore, R.C. 1978. Hybocrinida, T564–T574. In Moore, R.C. & Teichert, C. (eds) Treatise on Invertebrate Paleontology. Part T. Echinodermata 2(2). The Geological Society of America & The University of Kansas, Boulder, Colorado & Lawrence, Kansas.

Sun, Y.C. 1948. The early occurrence of some Ordovician and Silurian cystoids from western Yunnan and its significance. Palaeontological Novitates 1, 1–8.

Ubaghs, G. 1967. Eocrinoidea, S455–S495. In Moore, R.C. (ed.) Treatise on Invertebrate Paleontology. Part S. Echinodermata 1(2). The Geological Society of America & The University of Kansas, Boulder, Colorado & Lawrence, Kansas.

Ubaghs, G. 1969. Aethocrinus moorei Ubaghs, n. gen., n. sp., le plus ancien crinoide dicyclique connu. University Kansas Paleontological Contributions 38, 1–25.

Webby, B.D. 2004. Introduction, 1–37. In Webby, B.D., Paris, F., Droser, M.L. & Percival, I.G. (eds) The Great Ordovician Biodiversification Event. Columbia University Press, New York.View article