Abstract

The trematosaurid genus Thoosuchus Efremov, 1940, which is the type genus for the subfamily Thoosuchinae, is revised and its diagnosis is emended. This genus includes T. yakovlevi and T. tuberculatus, previously identified from the Rybinskian Regional Stage (Lower Triassic, Lower Olenekian), and the new species T. abbasovi sp. nov. The morphotype of the latter species is characterized by a number of apomorphic characters typical of more recent trematosaurid subfamilies: Platysteginae and Trematosaurinae (widely spaced orbits, the absence of an anteromedial projection of the postorbital, a narrowed middle ear cavity, a flattened depressor part of the lamina ascendens, and a well-developed crista posterior on the pterygoid), which is consistent with the later (Sludkian) age of the new species.

中文翻译：

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东欧吸鼻龙类迷宫齿兽的新数据：5. Thoosuchus Efremov 属，1940

摘要

1940 年，吸嘴龙亚科 Thoosuchinae 的类型属Thoosuchus Efremov 进行了修订，并修正了其诊断。该属包括T. yakovlevi和T. tuberculatus，以前从 Rybinskian 区域阶段（下三叠纪，下 Olenekian）鉴定，以及新种T. abbasovisp. 十一月 后一物种的形态型以一些更近代的吸音龙亚科的典型变形特征为特征：扁形龙亚科和吸音龙亚科（眼眶间距宽，没有眶后的前内侧投影，中耳腔变窄，下垂体的下压部分变平椎板上升，翼骨上有一个发育良好的后嵴），这与新物种的后期（Sludkian）年龄一致。