A truly gigantic pliosaur (Reptilia, Sauropterygia) from the Kimmeridge Clay Formation (Upper Jurassic, Kimmeridgian) of England

IF 1.2 4区地球科学 Q2 Earth and Planetary Sciences

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI:10.1016/j.pgeola.2023.04.005

David M. Martill, Megan L. Jacobs, Roy E. Smith

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引用次数: 2

Abstract

Four isolated cervical vertebrae from the Kimmeridge Clay Formation (Upper Jurassic, Kimmeridgian) of Abingdon, Oxfordshire, England are identified as from a pliosaurid plesiosaurian sauropterygian on account of their shortness relative to width and height, their near platycoelous nature and the location of tall rib facets on the centrum body. They are noteworthy for their size, with a maximum width of 269 mm, maximum height of 222 mm and maximum length of 103 mm. Simple scaling and comparisons with cervical vertebrae of Mid Jurassic pliosaurs Peloneustes and Liopleurodon, and the Early Cretaceous Stenorhynchosaurus and Sachicasaurus suggest a total body length of between ~ 9.8 m and 14.4 m for the Abingdon Kimmeridge Clay pliosaur. Likely the true length was towards the higher end of this range.

A genus and species cannot be confidently determined on the basis of the described material, but they likely belong to Pliosaurus sp. or a similar animal, for which a precise neck length is not known. We estimate a neck length of 0.77 m for Pliosaurus ?brachyspondylus based on the average cervical lengths provided for specimen CAMSM J.35991.

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一种来自英国Kimmeridge粘土组（上侏罗纪，Kimmeridgian）的真正巨大的上龙（爬行纲，Sauropterygia）

来自英国牛津郡阿宾顿Kimmeridge Clay Formation（上侏罗纪，Kimmeridgian）的四块孤立的颈椎被鉴定为来自上龙类蛇颈龙类蜥脚目，因为它们相对于宽度和高度来说很短，具有近板状的性质，以及高肋面在椎体上的位置。它们的尺寸值得注意，最大宽度为269 mm，最大高度222 mm，最大长度103 简单的缩放和与中侏罗纪上龙Peloneustes和Liopleurodon以及早白垩纪Stenorhynchosaurus和Sachicasaurus的颈椎的比较表明，它们的总身体长度在~9.8之间 m和14.4 m代表阿宾顿-基默里奇粘土上龙。真实长度很可能接近这个范围的高端。根据所描述的材料，无法确定一个属和物种，但它们很可能属于上龙属或类似动物，其确切的颈部长度尚不清楚。我们估计颈部长度为0.77 m代表上龙？基于为标本CAMSM J.35991提供的平均颈部长度的短髁。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Geologists Association 地学-地质学

CiteScore

2.70

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： The Proceedings of the Geologists'' Association is an international geoscience journal that was founded in 1859 and publishes research and review papers on all aspects of Earth Science. In particular, papers will focus on the geology of northwestern Europe and the Mediterranean, including both the onshore and offshore record. Following a long tradition, the PGA will focus on: i) a range of article types (see below) on topics of wide relevance to Earth Sciences ii) papers on aspects of Earth Science that have societal relevance including geoconservation and Earth management, iii) papers on palaeoenvironments and palaeontology of the Mesozoic and Cenozoic, iv) papers on aspects of Quaternary geology and climate change, and v) papers on the history of geology with particular reference to individuals that have shaped the subject. These topics will also steer the content of the themes of the Special Issues that are published in the PGA.