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Triassic cynodont reptiles from antarctica

American Museum Novitates (2611): 1-30

Triassic cynodont reptiles from antarctica

Sixteen specimens of cynodont reptiles from the Lower Triassic Fremouw Formation were collected during the austral summer of 1970-1971 in the central Transantarctic Mountains of Antarctica. The fossils are described. Fourteen specimens are referable to Thrinaxodon liorhinus Seeley, a characteristic cynodont from the Lower Triassic Lystrosaurus Zone, Middle Beaufort Beds of the Karroo Series in South Africa. Two are referred to Cynodontia incertae sedis, one being a mold in the rock of a heavy mandibular ramus, the other a right zygomatic arch with associated posterior parts of the mandibular rami, other fragments of skull bones and certain postcranial elements, all representing a cynodont considerably larger than a typical Thrinaxodon. The presence of T. liorhinus in Antarctica constitutes one more element in the chain of evidence indicating that a Lystrosaurus fauna, very similar to, if not completely identical with, the Lystrosaurus fauna of southern Africa inhabited what is now eastern Antarctica at the beginning of Mesozoic time. The association of the Antarctic-African species, L. murrayi, L. curvatus, and Procolophon trigoniceps, described in previous papers together with T. liorhinus, confirms the geological-geophysical interpretation indicating a close link between Antarctica and Africa in early Triassic time.

Accession: 006840739

Related references

Colbert Edwin H., 1977: Cynodont reptiles from the Triassic of Antarctica. Antarctic Journal of the United States 12(4): 119-120

Chatterjee S.; Jain S.L.; Kutty T.S.; Chowdhury T.K.R., 1969: On the discovery of triassic cynodont reptiles from india. Science & Culture 35(8): 411-413

Romer, A.S., 1969: The Brazilian Triassic cynodont reptiles Belesodon and Chiniquodon. Brevoria. 332: 1-16

Anonymous, 1969: The Chanares (Argentina) Triassic reptile fauna 5. A new chiniquodontid cynodont, Probelesodon lewisi cynodont ancestry.

Romer A.S., 1969: The chanares argentina triassic reptile fauna part 5 a new chiniquodontid cynodont probelesodon lewisi cynodont ancestry. Breviora: 1-24

Colbert E.H.; Kitching J.W., 1981: Scaloposaurian reptiles from the triassic of antarctica. Among the theriodont reptiles discovered in the Lower Triassic Fremouw Formouw Fomation of Antarctica during the austral summer of 1970-1971, are several scaloposaurian skulls, jaws and parts of postcranial skeletons. Of particular significance ar...

Datta, PM.; Das, DP., 1998: The first report of cynodont filling from Triassic and discovery of monotreme from Upper Triassic.. Geological Survey of India News. 1997( ) April-December; 282-4: 41

Broom, R., 1911: On the structure of the skull in Cynodont Reptiles. Proceedings of the Zoological Society of London, 893-925

Huene, Friedrich V., 1928: A cynodont from the Triassic of Brazil. Describes the skull and jaw of GOMPHODONTOSTJCHUS (p. 264) (Cynodontia), based on G. brasiliensis* (p. 264), and discusses its relationship to the other known cynodont reptiles, all of which are listed by families, with their horizons. Five specie...

Hasiotis, S.T.; Miller, M.F.; Isbell, J.; Babcock, L.E.; Collinson, J.W., 1999: Triassic trace fossils from Antarctica: burrow evidence of crayfish or mammal-like reptiles? Resolving crayfish from tetrapod burrows. Freshwater Crayfish, 12: 71-81