On the affinities of Tetraceratops insignis, an Early Permian synapsid

• Autorzy: Amson E. , Laurin M.
• Języki publikacji: EN

Abstrakty

EN

The affinities of the Early Permian synapsid Tetraceratops insignis have been reevaluated several times since the early 20th century, being considered as an eothyridid, a sphenacodontid, or a therapsid. This controversy continues into the 21st century, with recently raised doubts about the interpretation of Tetraceratops as the oldest known therapsid, a hypothesis supported by the only redescription of this fossil in the second half of the 20th century. Our study examines the arguments proposed to refute therapsid affinities, and concludes that Tetraceratops indeed is the sister−group of all other known therapsids. The most recently published phylogenetic data matrix that includes Tetraceratops fails to confirm its therapsid affinities. However, adding seven characters to that matrix leads to the conclusion that Tetraceratops is the basal−most and oldest therapsid. The recent suggestion of a Laurasian origin of therapsids appears poorly supported; too few data are available on the distribution of Permian synapsids to settle this question.

Słowa kluczowe

EN

Tetraceratops insignis; Early Permian; Permian; synapsid; Therapsida; phylogenesis; biogeography; range extension; Paleozoic; Pangaea; North America; fossil; paleontology

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2011
• Tom: 56
• Numer: 2
• Opis fizyczny: p.301-312,fig.,ref.

Twórcy

autor

Amson E.

• “Centre de Recherches sur la Paleobiodiversite et les Paleoenvironnements”, Museum National d’Histoire Naturelle, Batiment de Geologie, Case Postale 48, 43 rue Buffon, 75231 Paris cedex 05, France

autor

Laurin M.

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