A new species of Cricosaurus (Thalattosuchia, Metriorhynchidae) based upon a remarkably well-preserved skeleton from the Upper Jurassic of Germany

IF 2 4区地球科学 Q1 Earth and Planetary Sciences

Palaeontologia Electronica Pub Date : 2021-06-13 DOI:10.26879/928

S. Sachs, M. Young, Pascal Abel, H. Mallison

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引用次数: 8

Abstract

Herein we describe a new and exceptionally well-preserved skeleton of the metriorhynchid thalattosuchian Cricosaurus from the upper Kimmeridgian Torleite Formation of Painten in Bavaria (Southern Germany). The specimen is articulated, shows soft-tissue preservation, and represents one of the most complete metriorhynchid skeletons known. The exceptional preservation allows us to explore the morphological variation of the tail region in the Metriorhynchidae, a part of the skeleton that has long been neglected. Based on our description and phylogenetic analyses, we name this specimen Cricosaurus albersdoerferi sp. nov. Our phylogenetic analyses recover a Cricosaurus subclade composed of four species from Southern Germany and one from Argentina. We provide revised diagnoses for the Southern German members of this subclade, revealing the presence of at least four closely-related Cricosaurus species in the upper Kimmeridgian-early Tithonian of Southern Germany. Interestingly, within this subclade there is evidence of rapid change in tail construction and feeding ecology. However, there is no evidence of sympatry between these taxa, and the two species known from the same ammonite subzone are exclusively found in different northernTethys lagoons. Most interesting, however, is the variation in the skulls, dorsal neural spines, the tail displacement units, and flukes between these different species. This previously unexplored variation within Metriorhynchidae hints to differences in locomotory abilities between different species. Sven Sachs. Naturkunde-Museum Bielefeld, Abteilung Geowissenschaften, Adenauerplatz 2, 33602 Bielefeld, Germany, and Im Hof 9, 51766 Engelskirchen, Germany. Sachs.Pal@gmail.com Mark T. Young. School of GeoSciences, Grant Institute, University of Edinburgh, James Hutton Road, Edinburgh, EH9 3FE, UK. Mark.Young@ed.ac.uk Pascal Abel. Senckenberg Centre for Human Evolution and Palaeoenvironment, Eberhard-KarlsUniversität Tübingen, Sigwartstraße 10, 72076 Tübingen, Germany pascal.abel@ifg.uni-tuebingen.de], Heinrich Mallison. Palaeo3D, Dorfstr. 11, 86641 Rain am Lech, Germany and CeNak, Universität SACHS ET AL.: A NEW Cricosaurus SPECIES 2 Hamburg, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany. mallison@palaeo3d.com

查看原文本刊更多论文

一种新的环鼻龙(Thalattosuchia, metriorhychidae)，发现于德国上侏罗纪保存完好的骨架上

在此，我们描述了来自巴伐利亚(德国南部)Painten上kimmeridian Torleite组的一具新的、保存非常完好的metriorhynchid thalattosuchian环状龙骨架。该标本是铰接的，显示软组织保存，并代表了已知的最完整的胎鼻鱼骨架之一。这种特殊的保存使我们能够探索长尾猴科的尾巴区域的形态变化，这是骨骼的一部分，长期以来一直被忽视。根据我们的描述和系统发育分析，我们将该标本命名为Cricosaurus albersdoerferi sp. nov.。我们的系统发育分析恢复了一个由德国南部的四个物种和阿根廷的一个物种组成的环龙亚支。我们对这个亚分支的德国南部成员进行了修订诊断，揭示了在德国南部的上基默里纪-早铁东纪至少有四个密切相关的环龙物种的存在。有趣的是，在这个亚支系中，有证据表明尾巴结构和摄食生态发生了快速变化。然而，没有证据表明这两个分类群之间有同属关系，而且来自同一菊石亚带的两个物种只在特提斯北部不同的泻湖中发现。然而，最有趣的是这些不同物种在头骨、背神经棘、尾部位移单位和吸虫方面的差异。这种以前未被探索过的鼠鼩科变异暗示了不同物种之间运动能力的差异。斯文。比勒菲尔德自然博物馆，Abteilung Geowissenschaften, Adenauerplatz 2, 33602比勒菲尔德，德国，Im Hof 9, 51766 Engelskirchen，德国。Sachs.Pal@gmail.com马克·t·杨。爱丁堡大学格兰特研究所地球科学学院，英国爱丁堡詹姆斯赫顿路eh93feMark.Young@ed.ac.uk帕斯卡尔·阿贝尔。senkenberg人类进化与古环境研究中心，Eberhard-KarlsUniversität tbingen, Sigwartstraße 10,72076 tbingen，德国pascal.abel@ifg.uni-tuebingen.de]， Heinrich Mallison。paleo3d, Dorfstr. 11, 86641 Rain am Lech, Germany and CeNak, Universität SACHS ET AL.:一种新的环状龙物种2 Hamburg, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany。mallison@palaeo3d.com

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来源期刊

Palaeontologia Electronica 地学-古生物学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Founded in 1997, Palaeontologia Electronica (PE) is the longest running open-access, peer-reviewed electronic journal and covers all aspects of palaeontology. PE uses an external double-blind peer review system for all manuscripts. Copyright of scientific papers is held by one of the three sponsoring professional societies at the author''s choice. Reviews, commentaries, and other material is placed in the public domain. PE papers comply with regulations for taxonomic nomenclature established in the International Code of Zoological Nomenclature and the International Code of Nomenclature for Algae, Fungi, and Plants.