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Preliminary description and phylogenetic position of a new plesiosaur (Reptilia: Sauropterygia) from the Toarcian of Holzmaden, Germany

Published online by Cambridge University Press:  20 May 2016

F. Robin O'keefe
F. Robin O'keefe*
Affiliation:
Department of Anatomy, New York College of Osteopathic Medicine, Old Westbury 11568,
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Abstract

This paper offers a preliminary description of a plesiosaur (Reptilia: Sauropterygia) from the Lower Toarcian Posidonienschiefer near the village of Holzmaden in Baden-Württemberg, Germany, and discusses its phylogenetic relevance. This new taxon, Plesiopterys wildi new genus and species, is remarkable in its retention of several plesiomorphic features. A phylogenetic analysis places Plesiopterys as the sister group of the Plesiosauroidea, and as such the taxon is the most basal taxon yet known on the branch leading to this major clade. Plesiopterys possesses a high count of cervical vertebrae and a relatively small head, yet the limbs and limb girdles are plesiomorphic in proportion. The skull displays a mosaic of features, reminiscent of both Thalassiodracon and the rhomaleosaurids in some characters, yet similar to Plesiosaurus in others. The basicranium is plesiomorphic and resembles that of nothosaur-grade sauropterygians in several respects. A faunal comparison between Holzmaden and the Lower Toarcian deposits on the Yorkshire coast of England concludes that the Holzmaden fauna is more plesiomorphic than the roughly coeval Yorkshire fauna in two of three plesiosaur subclades.

Type
Research Article
Information
Journal of Paleontology , Volume 78 , Issue 5 , September 2004 , pp. 973 - 988
Copyright
Copyright © The Paleontological Society 

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References

Andrews, C. W. 1896. On the structure of the plesiosaurian skull. Quarterly Journal of the Geological Society (London), 52:246–253.Google Scholar
Andrews, C. W. 1913. A descriptive catalogue of the marine reptiles of the Oxford Clay, Pt. II. British Museum (Natural History), London, England, 206 p.Google Scholar
Anonymous. 1854. Report of the Council of the Yorkshire Philosophical Society, 1853:7–8.Google Scholar
Bardet, N., Godefroit, P., and Sciau, J. 1999. A new elasmosaurid plesiosaur from the Lower Jurassic of southern France. Palaeontology, 42(5):927–952.Google Scholar
Benton, M. J., and Spencer, P. S. 1995. Fossil Reptiles of Great Britain. Chapman and Hall, London, 386 p.Google Scholar
Benton, M. J., and Taylor, M. A. 1984. Marine reptiles for the Upper Lias (Lower Toarcian, Lower Jurassic) of the Yorkshire coast. Proceedings of the Yorkshire Geological Society, 44(4), pt. 29:399–429.CrossRefGoogle Scholar
Blake, J. F. 1876. Plesiosaurus longirostris, p. 250–252. In Tate, R. and Blake, J. F. (eds.), The Yorkshire Lias. Van Voorst, London.Google Scholar
Brown, D. S. 1981. The English Upper Jurassic Plesiosauroidea (Reptilia) and a review of the phylogeny and classification of the Plesiosauria. Bulletin of the British Museum (Natural History), 35(4):253–347.Google Scholar
Brown, D. S. 1984. Discovery of a specimen of the plesiosaur Colymbosaurus trochanterius (Owen) on the island of Portland. Proceedings of the Dorset Natural Historical and Archaeological Society, 105:170.Google Scholar
Carpenter, K. 1997. Comparative cranial anatomy of two North American Cretaceous plesiosaurs, p. 191–216. In Callaway, J. M. and Nicholls, E. L. (eds.), Ancient Marine Reptiles. Academic Press, San Diego, California.Google Scholar
Carte, A., and Baily, W. H. 1863. Description of a new species of Plesiosaurus from the Lias, near Whitby, Yorkshire. Journal of the Royal Dublin Society, 4:160–170.Google Scholar
Conybeare, W. D. 1822. Additional notices on the fossil genera Ichthyosaurus and Plesiosaurus. Transactions of the Geological Society of London, 2(1):103–123.Google Scholar
Cruickshank, A. R. I. 1994a. A juvenile plesiosaur (Plesiosauria: Reptilia) from the Lower Lias (Hettangian: Lower Jurassic) of Lyme Regis, England: a pliosauroid-plesiosauroid intermediate? Zoological Journal of the Linnean Society, 112:151–178.CrossRefGoogle Scholar
Cruickshank, A. R. I. 1994b. Cranial anatomy of the Lower Jurassic pliosaur Rhomaleosaurus megacephalus (Stutchbury) (Reptilia: Plesiosauria). Philosophical Transactions of the Royal Society of London B, 343:247–260.Google Scholar
Cruickshank, A. R. I. 1996. The cranial anatomy of Rhomaleosaurus thorntoni Andrews (Reptilia, Plesiosauria). Bulletin of the Natural History Museum, London (Geology), 52(2):106–114.Google Scholar
Cruickshank, A. R. I. 1997. A Lower Cretaceous pliosaurid from South Africa. Annals of the South African Museum, 105(2):207–226.Google Scholar
Crux, J. A. 1984. Biostratigraphy of Early Jurassic calcareous nannofossils from southwest Germany. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 169(2):160–186.Google Scholar
Dames, W. 1895. Die Plesiosaurier der süddeutschen Liasformation. Abhandlungen der Königliche Preussische Akademie der Wissenschaften zu Berlin, p. 1–83.Google Scholar
de Blainville, H. D. 1835. Description de quelques espèces de reptiles de la Californie, précédée de l'analyse d'un système general d'Erpetologie et d'Amphibiologie. Nouvelles Annales du Muséum (National) d'History Naturaelle (Paris), 4:233–296.Google Scholar
Fraas, E. 1910. Plesiosaurier aus dem oberen Lias von Holzmaden. Palaeontographica, 57:105–140.Google Scholar
Harland, W. B., Armstrong, R. L., Cox, A. V., Craig, L. E., Smith, A. G., and Smith, D. G. 1989. A Geologic Time Scale. Cambridge University Press, Cambridge, England, 263 p.Google Scholar
Lydekker, R. 1889a. Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural History), Pt. 2, containing the orders Ichthyopterygia and Sauropterygia. British Museum (Natural History), London, 307 p.Google Scholar
Lydekker, R. 1889b. On the remains and affinities of the five genera of Mesozoic reptiles. Quarterly Journal of the Geological Society of London, 45:41–59.Google Scholar
Maisch, M. W., and Rücklin, M. 2000. Cranial osteology of the sauropterygian Plesiosaurus brachypterygius from the lower Toarcian of Germany. Palaeontology, 43(1):29–40.CrossRefGoogle Scholar
Meyer, H. v. 1842. Simosaurus, die Stumpfschnauze, ein Saurier aus dem Muschelkalke von Lunéville. Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefaktenkunde, 1842:184–197.Google Scholar
O'keefe, F. R. 2001a. A cladistic analysis and taxonomic revision of the Plesiosauria (Reptilia: Sauropterygia). Acta Zoologica Fennica, 213:1–63.Google Scholar
O'keefe, F. R. 2001b. Ecomorphology of plesiosaur flipper geometry. Journal of Evolutionary Biology, 14:987–991.Google Scholar
O'keefe, F. R. 2002. The evolution of plesiosaur and pliosaur morphotypes in the Plesiosauria (Reptilia: Sauropterygia). Paleobiology, 28(1):101–112.Google Scholar
O'keefe, F. R.In press. Neoteny and the plesiomorphic condition of the plesiosaur basicranium. Chapter XIn Carrano, M. T., Gaudin, T. J., Blob, R. W., and Wible, J. R. (eds.), Amniote Paleobiology. University of Chicago Press, Illinois.Google Scholar
O'keefe, F. R., Rieppel, O., and Sander, P. M. 1999. Shape disassociation and inferred heterochrony in a clade of pachypleurosaurs (Reptilia, Sauropterygia). Paleobiology, 25(4):504–517.Google Scholar
Owen, R. 1840a. A description of a specimen of the Plesiosaurus macrocephalus, Conybeare, in the Collection of Viscount Cole. Transactions of the Geological Society of London, second series, 5:515–535.Google Scholar
Owen, R. 1840b. Report on the British fossil reptiles, pt. 1, report of the ninth meeting of the British Association for the Advancement of Science, Birmingham 1839. London, p. 43–126.Google Scholar
Owen, R. 1860. On the orders of fossil and Recent Reptilia, and their distribution through time. Report of the British Association for the Advancement of Science, 29:153–166.Google Scholar
Owen, R. 1865. A monograph on the fossil Reptilia of the Liassic formations, Pt. 3. Palaeontological Society of London, England.Google Scholar
Phillips, J. 1854. On a new Plesiosaurus in the York Museum. Annual Report of the British Association for the Advancement of Science for 1853, p. 54.Google Scholar
Rieppel, O. 1994. The braincases of Simosaurus and Nothosaurus: monophyly of the Nothosauridae (Reptilia: Sauropterygia). Journal of Vertebrate Paleontology, 14(1):9–23.Google Scholar
Rieppel, O. 2000. Sauropterygia 1, p. 1–134. In Wellhhofer, P. (ed.), Encyclopedia of Paleoherpetology, pt. 12A, Verlag Dr. Friedrich Pfeil, München, Germany.Google Scholar
Rieppel, O., and Werneburg, R. 1998. A new species of the sauropterygian Cymatosaurus from the lower Muschelkalk of Thuringia, Germany. Palaeontology, 41(4):575–589.Google Scholar
Romer, A. S. 1956. Osteology of the Reptiles. University of Chicago Press, Illinois, 772 p.Google Scholar
Sander, P. M. 1989. The pachypleurosaurids (Reptilia: Nothosauria) from the Middle Triassic of Monte San Giorgio, (Switzerland), with the description of a new species. Philosophical Transactions of the Royal Society of London B, 325:561–670.Google Scholar
Storrs, G. W. 1993. Function and phylogeny in sauropterygian (Diapsida) evolution. American Journal of Science, 293A:63–90.CrossRefGoogle Scholar
Storrs, G. W. 1997. Morphological and taxonomic clarification of the genus Plesiosaurus, p. 145–190. In Callaway, J. M. and Nicholls, E. L. (eds.), Ancient Marine Reptiles. Academic Press, San Diego, California.Google Scholar
Storrs, G. W., and Taylor, M. A. 1996. Cranial anatomy of a new plesiosaur genus from the lowermost Lias, (Rhaetian/Hettangian) of Street, Somerset, England. Journal of Vertebrate Paleontology, 16(3):403–420.Google Scholar
Swinton, W. E. 1930. Preliminary account of a new genus and species of plesiosaur. Annals and Magazine of Natural History, 6(10):206–209.Google Scholar
Swofford, D. L. 2002. PAUP∗. Phylogenetic Analysis Using Parsimony (∗ and Other Methods). Version 4. Sinauer Associates, Sunderland, Massachusetts.Google Scholar
Taylor, M. A. 1997. Before the dinosaur: the historical significance of the fossil marine reptiles, p. xix–xlvi. In Callaway, J. M. and Nicholls, E. L. (eds.), Ancient Marine Reptiles. Academic Press, San Diego, California.Google Scholar
Taylor, M. A., and Cruickshank, A. R. I. 1993. A plesiosaur from the Linksfield erratic (Rhaetian, Upper Triassic) near Elgin, Morayshire. Scottish Journal of Geology, 29(2):191–6.Google Scholar
Urlichs, M., Wild, M., and Ziegler, B. 1994. Der Posidonien-Schiefer des unteren Juras und seine Fossilien. Stuttgarter Beiträge zur Naturkunde. Serie C (Allgemeinverständliche Aufsätze), 36.Google Scholar
Vaughn, P. P. 1955. The Permian reptile Araeoscelis restudied. Bulletin of the Museum of Comparative Zoology at Harvard College, 113(5):305–467.Google Scholar
White, T. E. 1940. Holotype of Plesiosaurus longirostris Blake and the classification of the plesiosaurs. Journal of Paleontology, 14(5):451–467.Google Scholar