{"title":"A new pliosaurid from the Oxford Clay Formation of Oxfordshire, UK","authors":"H. Ketchum, R. Benson","doi":"10.4202/app.00887.2021","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":50887,"journal":{"name":"Acta Palaeontologica Polonica","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Palaeontologica Polonica","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.4202/app.00887.2021","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PALEONTOLOGY","Score":null,"Total":0}
引用次数: 3
Abstract
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.
我们描述了一种新的长颈上龙，Eardasaurus powelli gen. et sp. nov.，基于英国牛津郡中侏罗世牛津粘土组的基本完整骨架。该标本使牛津粘土组已知的上龙属数量至少达到6个，有助于我们了解分类最丰富的上龙组合。波利耳达龙(Eardasaurus powelli gen. et sp. 11 .)的牙齿具有“隆状”的尖基底牙釉质脊，这种牙釉质脊以前只在中侏罗世上龙中发现过，可能在早期上龙中更为普遍。我们的系统发育分析表明，Eardasaurus powelli gen. et sp. 11 .嵌套在中侏罗世thalassophonean pliosaurids中，与Peloneustes philarchus的衍生性略高，是由andrewsi“Pliosaurus”、Simolestes vorax、Liopleurodon ferox、Pliosaurus spp.和brachachenines组成的一个类群的姐妹。
期刊介绍：
Acta Palaeontologica Polonica is an international quarterly journal publishing papers of general interest from all areas of paleontology. Since its founding by Roman Kozłowski in 1956, various currents of modern paleontology have been represented in the contents of the journal, especially those rooted in biologically oriented paleontology, an area he helped establish.
In-depth studies of all kinds of fossils, of the mode of life of ancient organisms and structure of their skeletons are welcome, as those offering stratigraphically ordered evidence of evolution. Work on vertebrates and applications of fossil evidence to developmental studies, both ontogeny and astogeny of clonal organisms, have a long tradition in our journal. Evolution of the biosphere and its ecosystems, as inferred from geochemical evidence, has also been the focus of studies published in the journal.
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