A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
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贝利开槽龙（鸟臀龙：角龙科）的新标本、该属的修订以及颅后在角龙类恐龙分类学和系统学中的应用
DOI：
10.11646/zootaxa.2963.1.1
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发表时间：
2011
期刊：
影响因子：
0.9
通讯作者：
MAIDMENT S
中科院分区：
文献类型：
--
作者：
MAIDMENT S
威廉·卡特勒于1919年至1920年在加拿大艾伯塔省恐龙公园组出土的一件此前未被描述的查尔马苏标本，可与开角龙联系起来。该标本包括一个几乎完整的头骨，其中的颅骨元素是脱节的，这在开角龙中是独一无二的，这使得人们能够首次详细检查它们的形态。存在着完整的脑壳，可以与其他角鲸的脑壳进行比较。标本还保留了未压碎和未变形的后颅骨，包括颈椎、背椎和骶椎以及肢体元素。开角龙的脊柱此前从未被详细描述过，NHMUK R4948提供了检查它的机会，因为它的脊椎保存状态无与伦比。最近描述了一种新的Chamosaine属的增殖；它们中的许多不同之处只是在褶皱和壁上的形态细节上。其中几个是基于以前提交给开角龙的标本。因此，开角龙与其他坎帕尼亚跳龙之间的区别尚不清楚。然而，开角龙属和属内的种基于独特的特征和褶皱形态的组合是可诊断和有效的。对各种中央龙和节肢龙的颅后形态的详细研究突出了两个主要的角足类分支以前未被描述的突触同形，集中在胸带和前肢。开角龙百合参考的标本的脊椎公式的不一致表明，角足类的头骨可能在物种和属之间的差异比之前认为的要大得多，并且头骨后的特征应该被纳入系统发育和分类研究。
A previously undescribed chasmosaurine specimen excavated in 1919–1920 by William Cutler from the Dinosaur Park Formation of Alberta, Canada is referable to Chasmosaurus belli. The specimen comprises an almost complete skull in which, uniquely among Chasmosaurus, the cranial elements are disarticulated, allowing detailed examination of their morphology for the first time. The complete braincase is present and allows comparison with the braincase of other ceratopsians. The specimen also preserves an uncrushed and undistorted postcranium, including cervical, dorsal and sacral vertebrae and limb elements. The vertebral column of Chasmosaurus has never previously been described in detail, and NHMUK R4948 affords the opportunity to examine it because of the unparalleled state of vertebral preservation. A proliferation of new chasmosaurine genera has recently been described; many of them differ from each other only in details of frill and epiparietal morphology. Several of these are based on specimens previously referred to Chasmosaurus. As a result, the characters that distinguish Chasmosaurus from other Campanian chasmosaurines are unclear. However, the genus Chasmosaurus and species within the genus are diagnosable and valid based on unique combinations of characters and frill morphology. Detailed examination of the postcranial morphology of a variety of centrosaurines and chasmosaurines has highlighted previously undescribed synapomorphies for the two major ceratopsid clades, concentrated in the pectoral girdle and forelimb. Inconsistencies in the vertebral formula of specimens referred to Chasmosaurus belli suggests that the postcrania of ceratopsids may vary between species and genera far more than previously thought, and that postcranial characters should be incorporated into phylogenetic and taxonomic studies.