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The postcranial skeleton of Discosauriscus Kuhn, a seymouriamorph tetrapod from the Lower Permian of the Boskovice Furrow (Czech Republic)

  • Jozef Klembara (a1) and Ivan Bartík (a2)

Abstract

The description of the postcranial skeleton of larval, metamorphic and early juvenile specimens of the genus Discosauriscus is based on three-dimensional material and includes a description of the ontogeny of the swollen neural arches and the central elements of the vertebrae. Discosauriscus has 24 (or 23) presacral vertebrae. The morphology of the atlas–axis complex is similar to that in Seymouria sanjuanensis. The neural arches start to swell slightly in specimens of late larval stage; they are completely swollen immediately after metamorphosis. There are about 40 caudal vertebrae and one sacral vertebra. The atlantal pleurocentrum is paired in metamorphic individuals. In postmetamorphic individuals, the pleurocentra 2–5 are not completely closed dorsally; the pleurocentra 6–30 form complete discs. The first haemal arch is situated on the sixth caudal vertebra. The atlantal rib is present. There are six caudal ribs. Discosauriscus has an anocleithrum which is the first record of this dermal pectoral element within seymouriamorphs and Lower Permian tetrapods. The scapula and the coracoid are separate elements. The phalangeal formula of the manus is 2, 3, 4, 5, 3. The iliac blade has a massive, almost horizontally oriented posterior process; the anterior process is absent. The phalangeal formula of the pes is 2, 3, 4, 5, 3. Rounded ventral scales are present. The comparison and evaluation of the available postcranial elements of Discosauriscus, Utegenia, Ariekanerpeton and Seymouria support the view that Discosauriscus and Ariekanerpeton, forming the family Discosauriscidae, are immediately related genera.

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Berman, D. S., Reisz, R. R. & Eberth, D. A. 1987. Seymouria sanjuanensis (Amphibia, Batrachosauria) from the Lower Permian Cutler Formation of north-central New Mexico and the occurrence of sexual dimorphism in that genus questioned. Canadian Journal of Earth Sciences 24, 1769–84.
Berman, D. S., Henrici, A. C, Sumida, S. S. & Martens, T. 2000. Redescription of Seymouria sanjuanensis (Seymouriamorpha) from the Lower Permian of Germany based on complete, mature specimens with discussion of paleoecology of the Bromacker locality assemblage. Journal of Vertebrate Paleontology 20, 253–68.
Berman, D. S. & Martens, T. 1993. First occurrence of Seymouria (Amphibia: Batrachosauria) in the Lower Permian Rotliegend of Central Germany. Annals of Carnegie Museum 62, 6379.
Bolt, J. R. 1990. Mississippian Vertebrates from Iowa. National Geographic Research 6, 339–54.
Bystrow, A. P. 1944. On Kotlassia prima (Amalitsky). Bulletin of the Geological Society of America 55, 379416.
Carroll, R. L. 1970. The ancestry of reptiles. Philosophical Transactions of the Royal Society of London B257, 267308.
Clack, J. A. 1987. Pholiderpeton scutigerum Huxley, an amphibian from the Yorkshire coal measures. Philosophical Transactions of the Royal Society of London B318, 1107.
Clack, J. A. 1994. Silvanerpeton miripedes, a new anthracosauroid from the Visean of East Kirkton, West Lothian, Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences 84, 369–76.
Coates, M. I. 1996. The Devonian tetrapod Acanthostega gunnari Jarvik: postcranial anatomy, basal tetrapod relationships and pattern of skeletal evolution. Transactions of the Royal Society of Edinburgh: Earth Sciences 87, 363421.
Coates, M. I. & Clack, J. A. 1991. Fish-like gills and breathing in the earliest known tetrapod. Nature 352, 234–6.
Credner, H. 1883. Die Stegocephalen aus dem Rothliegenden des Plauen'schen Grundes bei Dresden. Zeitschrift der deutschen geologischen Geselschaft 4, 276300.
Fritsch, A. 1879. Neue Ubersicht der in der Gaskohle und den Kalksteinen der Permformation in Bohmen vorgefundenen Tierreste. Sitsungsberichte der koniglichen bohmischen Geselschaft der Wissenschqften (Prag 1879), 184–95.
Fritsch, A. 1883. Fauna der Gaskohle und der Kalksteine der Permformation Bohmens, Bd. I, 1182. Prague: Selbstverlag.
Gauthier, J. A., Kluge, A. G. & Rowe, T. 1988. The early evolution of the Amniota. In Benton, M. J. (ed.) The phytogeny and classification of the tetrapods, Volume I: amphibians, reptiles, birds, 103–55. Oxford: Clarendon Press.
Godfrey, S. J. 1989. The postcranial skeletal anatomy of the Carboniferous tetrapod Greererpeton burkemorani Romer 1969. Philosophical Transactions of the Royal Society of London B323, 75133.
Godfrey, S. J. & Reisz, R. R. 1991. The vertebral morphology of Gephyrostegus bohemicus Jaekel 1902, with comments on the atlas-axis complex in primitive tetrapods. Historical Biology 5, 2736.
Heaton, M. J. 1980. The Cotylosauria: a reconsideration of a group of archaic tetrapods. In Panchen, A. L. (ed.) The terrestrial environment and the origin of land vertebrates, Systematics Association Special Volume 15, 497551. London: Academic Press.
Holmes, R. B. 1980. Proterogyrinus scheelei and the early evolution of the labyrinthodont pectoral limb. In Panchen, A. L. (ed.) The terrestrial environment and the origin of land vertebrates. Systematics Association Special Volume 15, 351–76. London: Academic Press.
Holmes, R. B. 1984. The Carboniferous amphibian Proterogyrinus scheelei, Romer, and the early evolution of tetrapods. Philosophical Transactions of the Royal Society of London B306, 431527.
Holmes, R. B. 1989. The skull and axial skeleton of the Lower Permian anthracosauroid amphibian Archeria crassidisca Cope. Palaeontographica A207, 161206.
Ivakhnenko, M. F. 1981. Discosauriscidae from the Permian of Tadzhikistan. Palentologicheskij Zhurnal 1, 114–28 [in Russian].
Ivakhnenko, M. F. 1987. Permian parareptiles of USSR. ‘Nauka’, Trudy Paleontologicheskogo Instituta Akademii Nauk 223, 1160 [in Russian].
Jarvik, E. 1980. Basic Structure and Evolution of Vertebrates, Vols. 1, 2. London: Academic Press.
Jarvik, E. 1996. The Devonian tetrapod Ichthyostega. Fossils & Strata 40, 1213.
Klembara, J. 1995. The external gills and ornamentation of skull roof bones of the Lower Permian tetrapod Discosauriscus (Kuhn 1933) with remarks to its ontogeny. Pala'ontologische Zeitschrift 69, 265–81.
Klembara, J. 1996a. The first record of subdivided clavicles and interclavicle in the seymouriamorph tetrapod Discosauriscus from the Lower Permian of the Boskovice Furrow (Czech Republic). Journal of Vertebrate Paleontology 16, 787–90.
Klembara, J. 1996b. The lateral line system of Discosauriscus austriacus (Makowsky 1876) and the homologization of the skull roof bones between tetrapods and fishes. Palaeontographica A240, 117.
Klembara, J. 1997. The cranial anatomy of Discosauriscus Kuhn, a seymouriamorph tetrapod from the Lower Permian of the Boskovice Furrow (Czech Republic). Philosophical Transactions of the Royal Society of London B352, 257302.
Klembara, J. & Meszároš, Š. 1992. New finds of Discosauriscus austriacus (Makowsky 1876) from the Lower Permian of the Boskovice Furrow (Czecho-Slovakia). Geologica Carpathica 43, 305–12.
Kuhn, O. 1933. Labyrinthodontia. In Quenstedt, W. (ed.) Fossilium Catalogus, I. Animalia, 61, 1114. Berlin: W. Junk Verlag.
Kuznetsov, V. V. & Ivakhnenko, M. F. 1981. Discosauriscids from the Upper Palaeozoic of South Kazakhstan. Paleontologicheskij Zhurnal 3, 102–10 [in Russian].
Laurin, M. 1995. Comparative cranial anatomy of Seymouria sanjuanensis (Tetrapoda: Batrachosauria) from the Lower Permian of Utah and New Mexico. Paleobios 16, 18.
Laurin, M. 1996a. A reevaluation of Ariekanerpeton, a Lower Permian seymouriamorph (Vertebrata: Seymouriamorpha) from Tadzhikistan. Journal of Vertebrate Paleontology 16, 653–65.
Laurin, M. 1996b. A redescription of the cranial anatomy of Seymouria baylorensis, the best known seymouriamorph (Tetrapoda: Batrachosauria). Paleobios 17, 116.
Laurin, M. 1996c. A reappraisal of Utegenia, a Permo-Carboniferous seymouriamorph (Tetrapoda: Batrachosauria) from Kazakhstan. Journal of Vertebrate Paleontology 16, 374–83.
Laurin, M. & Reisz, R. R. 1995. A reevaluation of early amniote phylogeny. Zoological Journal of the Linnean Society 113, 165223.
Lebedev, A. O. & Coates, M. I. 1995. The postcranial skeleton of the Devonian tetrapod Tulerpeton curtum Lebedev. Zoological Journal of the Linnean Society 114, 307–48.
Lee, M. S. Y. 1995. Historical burden in systematics and the interrelationships of ‘parareptiles’. Biological Reviews 70, 459547.
Makowsky, A. 1876. Uber einen neuen Labyrinthodonten, Archegosaurus austriacus nov. spec. Sitsungsberichte der keiserischen Akademie der Wissenschaft 73, 155–66.
Moss, J. L. 1972. The morphology and phylogenetic relationships of the Lower Permian tetrapod Tseajaia campi Vaughn (Amphibia: Seymouriamorpha). University of California Publications in Geological Sciences 98, 163.
Olson, E. C. 1936. The dorsal axial musculature of certain primitive Permian tetrapods. Journal of Morphology 59, 265311.
Panchen, A. L. 1966. The axial skeleton of the labyrinthodont Eogyrinus attheyi. Journal of Zoology, London 150, 199222.
Panchen, A. L. 1977. The origin and early evolution of tetrapod vertebrae. In Andrews, S. M., Miles, R. S. & Walker, A. D. (eds) Problems in Vertebrate Evolution, 289318. London & New York: Academic Press.
Romer, A. S. 1947. Review of the Labyrinthodontia. Bulletin of the Museum of Comparative Zoology, Harvard 99, 1368.
Romer, A. S. 1957. The appendicular skeleton of the Permian embolomerous amphibian Archeria. Contributions from the Museum of Paleontology, University of Michigan 13, 103–59.
Romer, A. S. 1976. Osteology of the Reptiles, 3rd impression. Chicago & London: The University of Chicago Press.
Smithson, T. R. 1985. The morphology and relationships of the Carboniferous amphibian Eoherpeton watsoni Panchen. Zoological Journal of the Linnean Society 85, 317410.
Smithson, T. R., Carroll, R. L., Panchen, A. L. & Andrews, S. M. 1994. Westlothiana lizziae from the Visean of East Kirkton, West Lothian, Scotland, and the amniote stem. Transactions of the Royal Society of Edinburgh: Earth Sciences 84, 383412.
Spinar, Z. V. 1952. Revision of some Moravian Discosauriscidae (Labyrinthodontia). Rozpravy Vstfedniho Ustavu Geologickeho 15, 1115 [in Czech].
Sumida, S. S. 1990. Vertebral morphology, alternation of neural spine height, and structure in Permo-Carboniferous tetrapods, and a reappraisal of primitive modes of terrestrial locomotion. University of California Publications in Zoology 122, 1133.
Sumida, S. S. 1997. Locomotor features of taxa spanning the origin of amniotes. In Sumida, S. S. & Martin, K. L. M. (eds) Amniote Origins: Completing the Transition to Land, 353–98. San Diego & New York: Academic Press.
Sumida, S. S., Lombard, R. E. & Berman, D. S. 1992. Morphology of the atlas-axis complex of the Late Palaeozoic tetrapod suborders suborders Diadectomorpha and Seymouriamorpha. Philosophical Transactions of the Royal Society of London B336, 259–73.
Sumida, S. S. & Lombard, R. E. 1991. The atlas-axis complex Late Paleozoic genus Diadectes and the characteristics atlas-axis complex across the amphibian to amniote transition. Journal of Paleontology 65, 973–83.
Švec, P. 1984. The vertebrae of the Lower Permian genus Discosauriscus Kilhn, 1933 (Amphibia, Discosauriscidae); notes on their morphology and evolution. Věstník Úsŕedního Ústavu Geologického 59, 291–7.
Watson, D. M. S. 1917. A sketch classification of the pre-Jurassic tetrapod vertebrates. Proceedings of the Royal Society of 1917, 167–86.
Werneburg, R. 1985. Zur Taxonomie der jungpaläozoischen Familie Discosauriscidae Romer 1947 (Batrachosauria, Amphibia). Freibergische Forschungshefte C400, 117–33.
White, T. E. 1939. Osteology of Seymouria baylorensis Broili. Bulletin of the Museum of Comparative Zoology, Harvard College 85, 325409.
Zhang, F., Li, Y. & Wan, X. 1984. A new occurrence of Permian seymouriamorphs in Xinjiang, China. Vertebrata Palasiatica 22, 294304 [in Chinese, English abstract].

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The postcranial skeleton of Discosauriscus Kuhn, a seymouriamorph tetrapod from the Lower Permian of the Boskovice Furrow (Czech Republic)

  • Jozef Klembara (a1) and Ivan Bartík (a2)

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