Cranial anatomy and taxonomy of the erythrosuchid archosauriform ‘Vjushkovia triplicostata’ Huene, 1960, from the Early Triassic of European Russia
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Authors
Butler, RJSennikov, AG
Dunne, EM
Ezcurra, MD
Hedrick, BP
Maidment, Susannah

Meade, LE
Raven, TJ
Gower, DJ

Issue date
2019-11-20Submitted date
2020-04-16Subject Terms
TaxonomyTriassic
Archosauriformes
body size
Russia
Metadata
Show full item recordAbstract
Erythrosuchidae are a globally distributed and important group of apex predators that occupied Early and Middle Triassic terrestrial ecosystems following the Permo-Triassic mass extinction. The stratigraphically oldest known genus of Erythrosuchidae is Garjainia Ochev, 1958, which is known from the late Early Triassic (late Olenekian) of European Russia and South Africa. Two species of Garjainia have been reported from Russia: the type species, Garjainia prima Ochev, 1958, and ‘Vjushkovia triplicostata’ von Huene, 1960, which has been referred to Garjainia as either congeneric (Garjainiatriplicostata) or conspecific (G. prima). The holotype of G. prima has received relatively extensive study, but little work has been conducted on type or referred material attributed to ‘V. triplicostata’. However, this material includes well-preserved fossils representing all parts of the skeleton and comprises seven individuals. Here, we provide a comprehensive description and review of the cranial anatomy of material attributed to ‘V. triplicostata’, and draw comparisons with G. prima. We conclude that the two Russian taxa are indeed conspecific, and that minor differences between them result from a combination of preservation or intraspecific variation. Our reassessment therefore provides additional information on the cranial anatomy of G. prima. Moreover, we quantify relative head size in erythrosuchids and other early archosauromorphs in an explicit phylogenetic context for the first time. Our results show that erythrosuchids do indeed appear to have disproportionately large skulls, but that this is also true for other early archosauriforms (i.e. proterosuchids), and may reflect the invasion of hypercarnivorous niches by these groups following the Permo-Triassic extinction.Citation
Richard J. Butler, Andrey G. Sennikov, Emma M. Dunne, Martin D. Ezcurra, Brandon P. Hedrick, Susannah C. R. Maidment, Luke E. Meade, Thomas J. Raven and David J. Gower 2019Cranial anatomy and taxonomy of the erythrosuchid archosauriform ‘Vjushkovia triplicostata’ Huene, 1960, from the Early Triassic of European RussiaR. Soc. open sci.6191289 http://doi.org/10.1098/rsos.191289Publisher
The Royal SocietyJournal
Royal Society Open ScienceType
Journal ArticleItem Description
© 2019 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.ISSN
2054-5703EISSN
2054-5703ae974a485f413a2113503eed53cd6c53
10.1098/rsos.191289
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