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首页> 外文期刊>Zoological Journal of the Linnean Society >Re-description of 'Steneosaurus' obtusidens Andrews, 1909, an unusual macrophagous teleosaurid crocodylomorph from the Middle Jurassic of England
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Re-description of 'Steneosaurus' obtusidens Andrews, 1909, an unusual macrophagous teleosaurid crocodylomorph from the Middle Jurassic of England

机译：'Steneosaurus'obtusidens Andusidens Anderws，1909年，来自英格兰中侏罗西克的一个不寻常的肠道Teleaurid Crocodylomorph

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摘要

Teleosaurids were a clade of crocodylomorphs that attained near-global distribution during the Jurassic Period. Within Teleosauridae, one particular sub-clade of durophagous/macrophagous taxa achieved large body sizes and were apex predators in shallow marine environments during the Late Jurassic and Early Cretaceous in Europe and around the coast of the Tethys Seaway. Unfortunately, the origins of this clade are still poorly understood. 'Steneosaurus' obtusidens is a little-studied macrophagous species from the Oxford Clay Formation (Callovian, Middle Jurassic) of the UK and near Migne-les-Lourdines (Middle Callovian) in France. Despite being considered a sister taxon of the Late Jurassic taxon Machimosaurus, the taxonomy of 'S.' obtusidens remains unclear. Although three different synonymies have been proposed (variously a subjective synonym of other taxa), these taxonomic hypotheses have not been based on detailed anatomical comparisons and thus have not been tested. Here, we re-describe the holotype of 'S.' obtusidens, demonstrate that it is indeed a valid taxon, restrict the referred specimens to a fragmentary skeleton, nearly complete skull, and partial rostrum, and establish a new monotypic genus, Lemmysuchus. Our re-description reveals five autapomorphies for Lemmysuchus obtusidens and nine apomorphic characters that support the tribe Machimosaurini (Lemmysuchus + Machimosaurus).
机译：Teleosaurids是在侏罗纪期间达到了近全球分布的鳄鱼龙。在Teleosauridae中，一类特定的小水管/巨大的分类群在欧洲后期侏罗纪和早期白垩纪和Thethys Seaway海岸周围的浅海洋环境中占浅海洋环境中的一个特定的副血管。不幸的是，这种思想家的起源仍然很清楚。 'Steneosaurus'ondusidens是来自英国牛津粘土形成（Callovian，中侏罗西州）和法国的Migne-Les-Lourdines（中间Callovian）的一点学习的巨噬物种。尽管被认为是侏罗纪晚期的姐妹分类群体，但“S”的分类学持持续尚不清楚。虽然已经提出了三种不同的同义词（不同的同义词，但是，这些分类假设尚未基于详细的解剖学比较，因此尚未进行测试。在这里，我们重新描述了“S”的全息型持魔者表明它确实是有效的分类群，将被提到的标本限制为零碎的骨架，几乎完全头骨和部分讲台，并建立了一个新的单调型属lemmysuchus。我们的重新描述揭示了lemmysuchus obtusidens的五个自身形式，以及支持部落机械龙（Lemmysuchus + Machimosaurus）的九个Abomorphic角色。

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