Systematic position and variability of the Devonian nautiloids Hercoceras and Ptenoceras from the Prague Basin (Czech Republic)

 

Authors: Turek V

Published in: Bulletin of Geosciences, volume 82, issue 1; pages: 1 - 10; Received 8 January 2007; Accepted in revised form 13 February 2007;

Keywords: Cephalopoda, Nautiloidea, taxonomy, variability, Lower Devonian, Prague Basin, Barrandian,

full text (PDF, 0.45 MB)

Export to RIS

 

Abstract

The Devonian nautiloids Hercoceras Barrande, 1865 and Ptenoceras Hyatt, 1894 are closely related and should be classified within the single oncocerid family of Hercoceratidae Hyatt, 1884, which has priority before the family Ptenoceratidae Teichert, 1939. This is supported particularly by the similarity of their embryonic shell and by the character and ontogeny of ventrolateral outgrowths. The intraspecific variability of shells in Hercoceras mirum Barrande, 1865 (Lower Devonian, Prague Basin, Czech Republic) is striking and unusual among nautiloids. The variability in Ptenoceras alatum (Barrande, 1865) is also high, demonstrating fluent transitions between individual morphotypes. Therefore, the other two species of this genus described from the Pragian Stage of the Prague Basin, Ptenoceras modicum (Barrande, 1877) and Ptenoceras barrandei Zhuravleva, 1974 should be assigned to the single species Ptenoceras alatum.

References

Barrande, J. 1865–1877. Systeme silurien du centre de la Boheme. Recherches paléontologiques, Iere partie, vol. II, Céphalopodes. Paris, Praha.

Chirat, R. 2001. Anomalie of embryonic shell growth in post-Triassic Nautilida. Paleobiology 27(3), 485–499.View article

Dzik, J. 1984. Phylogeny of the Nautiloidea. Palaeontologia Polonica 45, 1–219.

Dzik, J. & Korn, D. 1992. Devonian ancestors of Nautilus. Paläontologische Zeitschrift 66(1/2), 81–98.

Flower, R.H. 1945. Classification of Devonian nautiloids. American Midland Naturalist 33(3), 675–724.View article

Foerste, A.F. 1926. Actinosiphonate, trochoceroid and other cephalopods. Denison University Bulletin, Journal of the scientific laboratories 21, 285–383.

Hyatt, A. 1883–1884. Genera of fossil cephalopods. Boston Society Natural History Proceedings 22, 273–338.

Hyatt, A. 1894. Phylogeny of an acquired characteristic. American Philosophical Society Proceeding 32, 349–647.

Chlupáč, I. 1976. The Bohemian Lower Devonian stages and remarks on the Lower-Middle Devonian boundary. Newsletter on Stratigraphy 5(2/3), 168–189.

Chlupáč, I. 1990. Structure and environment of the ichnofossil Zoophycos in the Lower Devonian of Bohemia, Czechoslovakia. Časopis pro mineralogii a geologii 35(4), 373–389.

Chlupáč, I., Lukeš, P. & Zikmundová, J. 1979. The Lower/Middle Devonian boundary beds in the Barrandian area, Czechoslovakia. Geologica et Palaeontologica 13, 125–156.

Kummel, B., Furnish, W.M. & Glenister, B. 1964. Nautiloidea–Nautilida, 383–457. In Moore, R.C. (ed.) Treatise on invertebrate paleontology, part K, Mollusca 3. The University of Kansas Press, Lawrence.

Manda, Š. 2001. Some new or little known cephalopods from the Lower Devonian Pragian carbonate shelf (Prague Basin, Bohemia) with remarks on Lochkovian and Pragian cephalopod evolution. Journal of the Czech Geological Society 46(3–4), 269–285.

Miller, A.K. 1932. The mixochoanites cephalopods. State University Iowa Studies Natural History, new series 14(4), 1–67.

Novák, O. 1886. Zur Kenntniss se Fauna dert Etage F–f1 in der Palaeozoischen Schichtengruppe Böhmens. Sitzungsberichte der Keiserlichen Böhmischen Gesellschaft der Wissenschaften 1886, 1–27.

Shimanskij, V.N. 1967. Kamenougolnye Nautilida. Trudy paleontologičeskogo instituta 115, 1–257.

Teichert, C. 1964. Morphology of the hard parts, 13–59. In Moore, R.C. (ed.) Treatise on invertebrate paleontology, part K, Mollusca 3. The University of Kansas Press, Lawrence.

Teichert, C. 1967. Major features of cephalopods evolution, 162–210. In Teichert, C. & Yochelson, E.L. (eds) Essays in paleontology and stratigraphy. The University of Kansas Press, Lawrence.

Teichert, C. 1988. Main features of cephalopod evolution, 11–79. In Clarke, M.R. & Trueman, E.R. (eds) The Mollusca, vol. 12: Paleontology and neontology of cephalopods. Academic Press, Inc., San Diego.

Turek, V. & Marek, J. 1986. Notes on the phylogeny of the Nautiloidea. Paläontologische Zeitschrift 60(3–4), 245–253.

Zhuravleva, F.A. 1962. Otrjad Oncocerida, 101–104. In Ruzhencev, V.E. (ed.) Osnovy paleontologii. Molljuski – Golovonogie. I. Izdatelstvo Akademii nauk SSSR, Moskva.

Zhuravleva, F.A. 1972. Otpechatki muskulov-retraktorov u devonskich ptenoceratid. Paleontologičeskij žurnal 1972(1), 134–136.

Zhuravleva, F.A. 1974. Devonskie nautiloidei. Otrjady Oncocerida, Tarphycerida and Nautilida. Trudy paleontologičeskogo instituta 142, 1–160.

Zhuravleva, F.A. 1995. New early Devonian nautilids from Novaya Zemlya and Taimyr. Paleontological Journal 29(4), 20–35.

Zhuravleva, F.A. 2000. Novye ranedevonskie onkoceridy (Cephalopoda) Novoj Zemli. Paleontologičeskij žurnal 6, 18–25.

Zittel, K.A. 1884–1885. Handbuch der Palaeontologie, Abt. 1, Bd. 2, Mollusca und Arthropoda. 893 pp. München, Leipzig.

Zittel, K.A. 1900. Text-book of Palaeontology. 706 pp. Macmillan and Co., New York.