Distinctive azhdarchoid pterosaur jaws from the mid-Cretaceous Cambridge Greensand of eastern England and the Kem Kem Group of Morocco

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.2023.03.002

Roy E. Smith , David M. Martill , Samir Zouhri

引用次数: 0

Abstract

An isolated jaw fragment from the Late Cretaceous (Cenomanian) Cambridge Greensand Member of the West Melbury Marly Chalk Formation previously identified as a cestraciontid shark fin spine is referred to the pterosaur clade Azhdarchoidea on account of its lateral and occlusal foramina and edentuly. The specimen differs from the azhdarchoid Ornithostoma sedgwicki from the same deposit in having flat lateral surfaces and an acute dorsal/ventral apex. The specimen is similar in overall morphology to CAMSM B40085 from the same horizon and probably represents the corresponding jaw but from a different individual. Likely these specimens represent a new taxon but are considered too fragmentary to diagnose at present. A remarkably similar and distinctive morphology is found in unnamed pterosaur jaws from the Kem Kem Group (?Albian-Cenomanian) of Morocco, supporting the idea of faunal similarity between these two distant localities.

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英格兰东部剑桥-格林山白垩纪中期和摩洛哥凯姆-凯姆群的独特阿兹达乔翼龙颌

一块来自晚白垩世（Cenomanian）剑桥-格林森成员的西梅尔伯里-马利白垩岩组的孤立颌骨碎片，先前被鉴定为塞斯特龙类鱼翅棘，由于其侧孔和咬合孔以及缺牙，被称为阿兹达尔科翼龙支。该标本与来自同一矿床的azhdarchoid Ornithostoma sedgwicki的不同之处在于具有平坦的侧表面和尖锐的背侧/腹侧顶端。该标本在整体形态上与来自同一层位的CAMSM B40085相似，可能代表了相应的颌骨，但来自不同的个体。这些标本可能代表了一个新的分类单元，但目前被认为过于零碎而无法诊断。在摩洛哥凯姆-凯姆群（？阿尔比安-塞诺曼阶）的未命名翼龙颌中发现了一种非常相似和独特的形态，这支持了这两个遥远地区动物区系相似的观点。

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.