Postcranial morphology of the South African middle Permian pareiasaurs from the Karoo Basin of South Africa

Show simple item record van den Brandt, Marc J. Benoit, Julien Abdala, Fernando Rubidge, Bruce S. 2021-05-19T07:53:01Z 2021-05-28T07:53:01Z 2021-05-28
dc.identifier.issn 2410-4418
dc.description.abstract Pareiasaurs were relatively abundant and globally distributed herbivorous parareptiles of the middle to late Permian. The basal-most pareiasaurs, the Bradysauria, are restricted to the middle Permian of South Africa and went extinct at the end of the Guadalupian (Capitanian) at the top of the Tapinocephalus Assemblage Zone. Currently, three genera are recognized in this group: Bradysaurus, Embrithosaurus and Nochelesaurus, but their postcrania are poorly known, and consequently poorly understood. In this paper, our third contribution designed to improve understanding of the Bradysauria, we present a detailed comparative postcranial description and updated diagnoses for Bradysaurus baini, Embrithosaurus schwarzi and Nochelesaurus alexanderi. Bradysaurus baini has one postcranial autapomorphy: anterior dorsal osteoderms smooth and strongly convex, with an incipient central boss, and very light ornamentation. Three pelvic autopomorphies of Embrithosaurus schwarzi are confirmed: anterior portion of the iliac blades flat and vertical (not everted or upturned); iIiac blades diverge anteriorly, oriented at 45–60° off the sagittal plane; and a very thick pelvic symphysis. For Nochelesaurus alexanderi we remove all three of the postcranial autapomorphies previously proposed. To the diagnoses of each species, we have added several new distinguishing postcranial features, within the local group of middle Permian pareiasaurs. The results reinforce our previous cranial studies concluding that three valid species of pareiasaurs are represented in the South African middle Permian. en_ZA
dc.description.sponsorship Bi-national Cooperation Project (Russia-South Africa) NRF South Africa Centre of Excellence, Palaeosciences Palaeontological Scientific Trust CONICET en_ZA
dc.language.iso en en_ZA
dc.publisher Evolutionary Studies Institute en_ZA
dc.rights Copyright 2021 the Authors en_ZA
dc.subject Capitanian en_ZA
dc.subject Guadalupian en_ZA
dc.subject Parareptilia en_ZA
dc.subject Tapinocephalus Assemblage Zone en_ZA
dc.subject Pareiasauria en_ZA
dc.title Postcranial morphology of the South African middle Permian pareiasaurs from the Karoo Basin of South Africa en_ZA
dc.type Article en_ZA
dc.journal.volume 55 en_ZA
dc.journal.title Palaeontologia africana en_ZA
dc.description.librarian JNC2021 en_ZA 0000-0002-4967-7827 en_ZA 0000-0001-5378-3940 en_ZA 0000-0001-9838-2497 en_ZA 0000-0003-2477-1873 en_ZA

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