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首页> 外文期刊>Cretaceous Research >The small-bodied ornithischian dinosaurs Micropachycephalosaurus hongtuyanensis and Wannanosaurus yansiensis from the Late Cretaceous of China
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The small-bodied ornithischian dinosaurs Micropachycephalosaurus hongtuyanensis and Wannanosaurus yansiensis from the Late Cretaceous of China

机译：中国晚白垩世的小型鸟嘴恐龙微型头蛇宏图雁象和燕南腕象。

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摘要

The type material of the small-bodied ornithischian dinosaurs Micropachycephalosaurus hongtuyanensis and Wannanosaurus yansiensis from the Late Cretaceous of China is reviewed. Micropachycephalosaurus, from the Wangshi Formation (Campanian) of Shandong Province, was originally referred to the clade Pachycephalosauria, but some later authors have considered it a nomen dubium. However, despite the extremely fragmentary nature of the holotype specimen, Micropachycepholosaurus can be diagnosed by the presence of prominent grooves on the ventral surface of the centra of the posterior dorsal vertebra. Unambiguous pachycephalosaur synapomorphies cannot be identified in the currently available material, and we consider this taxon Cerapoda incertae sedis. Wannanosaurus, from the Xiaoyan Formation (Campanian-?early Maastrichtian) of Anhui Province, can be diagnosed by the extreme flexure of the humerus, and is clearly referable to Pachycephalosauria on the basis of a large number of synapomorphies. Assessment of the phylogenetic placement of this Wannanosaurus within Pachycephalosauria is complicated by the probable juvenile nature of the holotype and paratype specimens.
机译：综述了中国晚白垩世的小体鸟眼恐龙微突头龙和泥Wan。山东省汪氏组的微头头龙最初被称为“头头龙”进化枝，但后来的一些作者却认为它是一个名词性的。然而，尽管整型标本具有极强的破碎性，但通过在后背椎骨中央腹侧表面上存在明显的凹槽，可以诊断出微骨龙。在目前可用的材料中无法确定明确的肩龙突触同型，我们认为该分类群是无脊椎动物Cerapoda incertae sedis。来自安徽省小岩组（Campanian-？Maastrichtian）的Wannanosaurus可以通过肱骨的极度弯曲来诊断，并且根据大量的同形同形体可以明显地称为Pachycephalosauria。由于全型和副型标本的可能是幼稚的性质，对这种皖南龙在Pachycephalosauria中的系统发生位置的评估变得很复杂。

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