文章基本信息

标题：A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK
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作者：HILARY F. KETCHUM ; ROGER B.J. BENSON
期刊名称：Acta Palaeontologica Polonica
印刷版ISSN：0567-7920
电子版ISSN：1732-2421
出版年度：2022
卷号：67
期号：2
页码：297-315
DOI：10.4202/app.00887.2021
语种：English
出版社：Institute of Paleobiology PAS
摘要：We describe the anatomy of a new longirostrine pliosaurid, Eardasaurus powelli gen. et sp. nov., based on a substantially complete skeleton from the Middle Jurassic Oxford Clay Formation of Oxfordshire, UK. The specimen brings the number of pliosaurid genera known from the Oxford Clay Formation up to a minimum of six, contributing to our understanding of the most taxonomically rich pliosaurid assemblage. The teeth of Eardasaurus powelli gen. et sp. nov. have “carina-like” apicobasal enamel ridges, previously only identified in Liopleurodon ferox among Middle Jurassic pliosaurids, and which may be more widespread among early pliosaurids than has been recognised. Our phylogenetic analysis shows that Eardasaurus powelli gen. et sp. nov. is nested within Middle Jurassic thalassophonean pliosaurids, slightly more derived than Peloneustes philarchus, as sister to a group comprising “Pliosaurus” andrewsi, Simolestes vorax, Liopleurodon ferox, Pliosaurus spp. and brachauchenines.