A giant skull of the temnospondyl Xenotosuchus africanus from the Middle Triassic of South Africa and its ontogenetic implications

• Autorzy: Damiani R
• Języki publikacji: EN

Abstrakty

EN

A previously unreported large skull of the mastodonsaurid temnospondyl Xenotosuchus africanus, from the Cynognathus Assemblage Zone (Early to Middle Triassic) of the Beaufort Group, Karoo Basin of South Africa, is described. The species is plesiomorphic in most aspects of its cranial anatomy, and only one autapomorphy is tentatively identified herein, namely contact between the left and right exoccipitals posterior to the parasphenoid. The new specimen permits recognition of a growth series for X. africanus from sub−adult (all previously known specimens) to fully adult (new specimen) stages. Ontogenetic changes associated with this include changes in skull proportions, and changes in the morphology of the lacrimal flexure, frontal, postfrontal, cultriform process and body of the parasphenoid, and the transvomerine tooth row.

Słowa kluczowe

EN

Temnospondyli; Triassic; paleontology; ontogenesis; Africa; Middle Triassic; variation; temnospondyl form; Xenotosuchus africanus; South Africa; skull

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2008
• Tom: 53
• Numer: 1
• Opis fizyczny: p.75-84,fig.,ref.

Twórcy

autor

Damiani R

• Staatliches Museum fur Naturkunde Stuttgart, Rosenstein 1, D-70191 Stuttgart, Germany

Bibliografia

• Abdala, F., Hancox, P.J., and Neveling, J. 2005. Cynodonts from the Uppermost Burgersdorp Formation, South Africa, and their bearing on the biostratigraphy and correlation of the Triassic Cynognathus Assemblage Zone. Journal of Vertebrate Paleontology 25: 192–199.
• Boy, J.A. and Sues, H.−D. 2000. Branchiosaurs: larvae, metamorphosis and heterochrony in temnospondyls and seymouriamorphs.In: H. Heatwole and R.L. Carroll (eds.), Amphibian Biology, Volume 4. Palaeontology, the Evolutionary History of Amphibians, 1150–1197. Surrey Beatty and Sons, Chipping Norton.
• Broom, R. 1909. Notice of some new South African fossil amphibians and reptiles. Annals of the South African Museum 7: 270–278.
• Bystrow, A.P. and Efremov, J.A. 1940. Benthosuchus sushkini Efremova labyrinthodont from the Eotriassic of the Sharzenga River [in Russian]. Trudy Paleontologičeskogo Instituta 10: 1–152.
• Chernin, S. 1978. Three capitosaurs from the Triassic of South Africa: Parotosuchus africanus (Broom 1909); Kestrosaurus dreyeri Haughton 1925, and Parotosuchus dirus sp. nov. Palaeontologia Africana 21: 79–100.
• Damiani, R.J. 2001a. A systematic revision and phylogenetic analysis of Triassic mastodonsauroids (Temnospondyli: Stereospondyli). Zoological Journal of the Linnean Society 133: 379–482.
• Damiani, R.J. 2001b. Parotosuchus (Amphibia, Temnospondyli) from the Cynognathus Assemblage Zone (Early Triassic) of South Africa: cranial morphology and relationships. Alcheringa 25: 351–379.
• Damiani, R.J. 2001c. Cranial anatomy of the giant Middle Triassic temnospondyl Cherninia megarhina and a review of feeding in mastodonsaurids. Palaeontologia Africana 37: 41–52.
• Damiani, R.J. 2004. Temnospondyls from the Beaufort Group (Karoo Basin) of South Africa and their biostratigraphy. Gondwana Research 7: 165–173.
• Damiani, R.J., Neveling, J., and Hancox, P.J. 2001. First record of a mastodonsaurid (Temnospondyli, Stereospondyli) from the Early Triassic Lystrosaurus Assemblage Zone (Karoo Basin) of South Africa. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 221: 133–144.
• Damiani, R.J. and Rubidge, B.S. 2003. A review of the South African temnospondyl amphibian record. Palaeontologia Africana 39: 21–36.
• Damiani, R.J. and Warren, A.A. 1997. Reinterpretation of Parotosuchus wadei Cosgriff, a capitosaurid from the Triassic Narrabeen Group at Gosford, New South Wales, with comments on its growth stage. Alcheringa 21: 281–289.
• Damiani, R.J. and Yates, A.M. 2003. Thoosuchus yakovlevi and the relationships of the Trematosauroidea (Temnospondyli, Stereospondyli). Records of the Australian Museum 55: 331–342.
• Getmanov, S.N. 1986. On the individual variation of the skull in the benthosuchids as related to the development of the trematosaur in plan of organization. Paleontological Journal 1986: 76–85.
• Getmanov, S.N. 1989. Triassic amphibians of the East European platform (family Benthosuchidae Efremov) [in Russian]. Trudy Paleontologičeskogo Instituta 236: 1–102.
• Groenewald, G.H. and Kitching, J.W. 1995. Biostratigraphy of the Lystrosaurus Assemblage Zone. In: B.S. Rubidge (ed.), Biostratigraphy of the Beaufort Group (Karoo Supergroup). South African Committee for Stratigraphy, Biostratigraphic Series 1. 46 pp. Councilfor Geoscience, Pretoria.
• Hancox, P.J. 1998. A Stratigraphic, Sedimentological and Palaeoenvironmental Synthesis of the Beaufort−Molteno Contact in the Karoo Basin. 404 pp. Unpublished Ph.D. thesis, University of the Witwatersrand, Johannesburg.
• Hancox, P.J., Shishkin, M.A., Rubidge, B.S., and Kitching, J.W. 1995. A threefold subdivision of the Cynognathus Assemblage Zone (Beaufort Group, South Africa) and its palaeogeographical implications. South African Journal of Science 91: 143–144.
• Haughton, S.H. 1925. Investigations in South African fossil reptiles and Amphibia (Part 13). Annals of the South African Museum 22: 227–261.
• Kitching, J.W. 1977. The distribution of the Karroo vertebrate fauna. Bernard Price Institute for Palaeontological Research, Memoir 1: 1–131.
• Maryańska, T. and Shishkin, M.A. 1996. New cyclotosaurid (Amphibia: Temnospondyli) from the Middle Triassic of Poland and some problems of interrelationships of capitosauroids. Prace Muzeum Ziemi 43: 53–83.
• Morales, M. and Shishkin, M.A. 2002. A re−assessment of Parotosuchus africanus (Broom), a capitosauroid temnospondyl amphibian from the Triassic of South Africa. Journal of Vertebrate Paleontology 22: 1–11.
• Mukherjee, R.N. and Sengupta, D.P. 1998. New capitosaurid amphibians from the Triassic Denwa Formation of the Satpura Gondwana Basin, Central India. Alcheringa 22: 317–327.
• Ochev, V.G. [Očev, V.G.] 1972. Kapitozavroidnye labirintodonty ûugovostoka Evropejskoj časti SSSR. 268 pp. Izdatel'stvo Saratovskogo Universiteta, Saratov.
• Pawley, K. and Warren, A. 2004. Immaturity vs paedomorphism: a rhinesuchid stereospondyl postcranium from the Upper Permian of South Africa. Palaeontologia Africana 40: 1–10.
• Schoch, R.R. 1997. A new capitosaur amphibian from the Upper Lettenkeuper (Triassic: Ladinian) of Kupferzell (Southern Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 203: 239–272.
• Schoch, R.R. 1999. Comparative osteology of Mastodonsaurus giganteus (Jaeger, 1828) from the Middle Triassic (Lettenkeuper: Longobardian) of Germany (Baden−Württemberg, Bayern, Thüringen). Stuttgarter Beiträge zur Naturkunde Serie B 278: 1–175.
• Schoch, R.R. 2000. The status and osteology of two new cyclotosaurid amphibians from the Upper Moenkopi Formation of Arizona (Amphibia: Temnospondyli; Middle Triassic). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 216: 387–411.
• Schoch, R.R. 2001. Can metamorphosis be recognised in Palaeozoic amphibians? Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 220: 335–367.
• Schoch, R.R. and Milner, A.R. 2000. Stereospondyli. Handbuch der Paläoherpetologie, Teil 3B. 203 pp. Verlag Dr. Friedrich Pfeil, Munich.
• Shishkin, M.A., Rubidge, B.S., and Hancox, P.J. 1995. Vertebrate biozonation of the Upper Beaufort Series of South Africa—a new look on correlation of the Triassic biotic events in Euramerica and southern Gondwana. In: A. Sun and Y. Wang (eds.), Sixth Symposium on Mesozoic Terrestrial Ecosystems and Biota, Short Papers, 1995, 39–41. China Ocean Press, Beijing.
• Shishkin, M.A., Rubidge, B.S., and Kitching, J.W. 1996. A new lydekkerinid (Amphibia, Temnospondyli) from the Lower Triassic of South Africa: implications for evolution of the early capitosauroid cranial pattern. Philosophical Transactions of the Royal Society of London B351: 1635–1659.
• Steyer, J.S. 2000. Ontogeny and phylogeny in temnospondyls: a new method of analysis. Zoological Journal of the Linnean Society 130: 449–467.
• Steyer, J.S. 2002. The first articulated trematosaur “amphibian” from the Lower Triassic of Madagascar: implications for the phylogeny of the group. Palaeontology 45: 771–793.
• Steyer, J.S. 2003. A revision of the Early Triassic “capitosaurs” (Stegocephali, Stereospondyli) from Madagascar, with remarks on their comparative ontogeny. Journal of Vertebrate Paleontology 23: 544–555.
• Sulej, T. 2002. Species discrimination of the Late Triassic temnospondyl amphibian Metoposaurus diagnosticus. Acta Palaeontologica Polonica 47: 535–546.
• Warren, A.A. and Hutchinson, M.N. 1988. A new capitosaurid amphibian from the Early Triassic of Queensland, and the ontogeny of the capitosaur skull. Palaeontology 31: 857–876.
• Warren, A.A. and Schroeder, N. 1995. Changes in the capitosaur skull with growth: an extension of the growth series of Parotosuchus aliciae (Amphibia, Temnospondyli) with comments on the otic area of capitosaurs. Alcheringa 19: 41–46.
• Watson, D.M.S. 1958. A new labyrinthodont (Paracyclotosaurus) from the Upper Trias of New South Wales. Bulletin of the British Museum (Natural History) Geology 3: 233–263.
• Watson, D.M.S. 1962. The evolution of the labyrinthodonts. Philosophical Transactions of the Royal Society of London B 245: 219–265.
• Welles, S.P. and Cosgriff, J.W. 1965. A revision of the labyrinthodont family Capitosauridae and a description of Parotosaurus peabodyi n. sp. from the Moenkopi Formation of Northern Arizona. University of California Publications in Geological Sciences 54: 1–148.