An Enigmatic Neodiapsid Reptile from the Middle Triassic of England
An Enigmatic Neodiapsid Reptile from the Middle Triassic of England
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DOI：
10.1080/02724634.2020.1781143
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发表时间：
2020-10-06
影响因子：
1.4
通讯作者：
Benton, Michael J.
中科院分区：
文献类型：
--
作者：
Cavicchini, Iacopo;Zaher, Marta;Benton, Michael J.
早期双孔类的化石记录稀少，标本不常见且往往不完整，系统发育关系也很难确定。来自英格兰西南部德文郡中三叠世的早期双壳类新分类群Feralisaurus corami在此根据一个不完整但大部分铰接的骨架进行命名和描述，该骨架包括头骨、椎骨、胸带、肋骨和右前肢。CT扫描和由此产生的骨骼3D模型揭示了隐藏在砂岩基质中的解剖细节。这种新的双壳类的特征是：上颌骨高而无突出的鼻突，方骨有侧海螺，下颌低而有小的后突，圆锥形齿有侧齿植入，冠状突高，脊索椎骨，肱骨长而有内髁孔，棒状锁骨，“T”形锁骨间，肩胛喙突腹外侧突。系统发育分析，虽然表现出普遍的弱支持，retrievedFeralisaurus内Neodiapsida或干组Lepidosauromorpha：其形态支持后一种假设。这个标本增加了我们对鳞龙形目早期多样化和英国中三叠世陆生动物群的了解。
The fossil record of early diapsids is sparse, specimens are uncommon and often incomplete, and phylogenetic relationships are hard to determine. A new taxon of early diapsid,Feralisaurus coramifrom the Middle Triassic of Devon, south-western England, is here named and described from an incomplete but mostly articulated skeleton, comprising skull, vertebrae, pectoral girdle, ribs, and the right forelimb. CT scanning and the resultant 3D model of the skeleton reveal anatomical details otherwise buried in the sandstone matrix. This new diapsid is characterized by a plesiomorphically high maxilla without a prominent nasal process, a quadrate with a lateral conch, a low jugal with small posterior process, conical teeth with pleurodont implantation, a high coronoid process, notochordal vertebrae, a long humerus with an entepicondylar foramen, rod-like clavicles, a 'T'-shaped interclavicle, and a ventrolateral process of the scapulocoracoid. Phylogenetic analyses, although showing generalized weak support, retrievedFeralisauruswithin Neodiapsida or stem-group Lepidosauromorpha: its morphology supports the latter hypothesis. This specimen adds to our knowledge of the early diversification of Lepidosauromorpha and of English Middle Triassic terrestrial faunas.