The skull of the basal stegosaur Huayangosaurus taibaii and a cladistic diagnosis of stegosauria
The skull of the basal stegosaur Huayangosaurus taibaii and a cladistic diagnosis of stegosauria
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基础剑龙太白华阳龙的头骨和剑龙类的分支诊断
DOI：
10.1080/02724634.1992.10011463
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发表时间：
1992
影响因子：
1.4
通讯作者：
Z. Dong
中科院分区：
文献类型：
--
作者：
P. Sereno;Z. Dong
摘要中侏罗世剑龙化石--太白华阳龙的新发现，为剑龙类的早期演化提供了新的线索。这分类群的头骨被详细描述并且与其他thyreophorans的那些比较。华阳龙的颅和颅后自形包括高的前上颌骨和上颌骨牙齿数（分别为7和25-30），小的眶后角，肋间关节凸缘，以及由单一骨化块组成的腕骨。19个联会形迹将华阳龙和其他剑龙类统一起来，构成了剑龙类的一个修正的分支分类学诊断。华阳龙是所有剑龙的姊妹分类群，剑龙失去了上颌骨前的牙齿，减少了眶前窝的大小，增加了耻骨的耻骨前突的长度，并失去了沿着躯干的侧盾沿着行。
ABSTRACT The recent discovery of the Middle Jurassic stegosaur, Huayangosaurus taibaii has shed new light on the early phylogeny of Stegosauria. The skull of this taxon is described in detail and compared to those of other thyreophorans. Cranial and postcranial autapomorphies of Huayangosaurus include high premaxillary and maxillary tooth counts (7 and 25–30, respectively), small postorbital horn, intercostal articular flanges, and a carpus composed of a single coossified block. Nineteen synapomorphies unite Huayangosaurus and other stegosaurs and constitute a revised cladistic diagnosis for Stegosauria. Huayangosaurus is the sister-taxon to all other stegosaurs, which have lost premaxillary teeth, reduced the size of the antorbital fossa, increased the length of the prepubic process of the pubis, and lost lateral scute rows along the trunk.