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Pelecanimimus (Theropoda: Ornithomimosauria) postcranial anatomy and the evolution of the specialized manus in Ornithomimosaurs and sternum in maniraptoriforms
Zoological Journal of the Linnean Society ( IF 2.8 ) Pub Date : 2021-02-23 , DOI: 10.1093/zoolinnean/zlab013
Elena Cuesta 1, 2 , Daniel Vidal 3 , Francisco Ortega 3 , Masateru Shibata 1, 4 , José L Sanz 5, 6
Affiliation  

Pelecanimimus polyodon was discovered in 1993 in the Spanish Barremian fossil site of Las Hoyas, being the first ornithomimosaur described from Europe. So far, there has been no detailed description of the holotype of Pelecanimimus, which is composed of the anterior-half of an articulated skeleton. Here we report a new, detailed, revised and more accurate osteological description of its postcranial skeleton, comparing this new data to information about Ornithomimosauria from the last three decades. This osteological and phylogenetic analysis of Pelecanimimus shows several ornithomimosaur synapomorphies and a unique combination of characters that emend its original diagnosis. Pelecanimimus diverged early in Ornithomimosauria and reveals an enlargement trend of the manus, shared with derived ornithomimosaurians, due to a long metacarpal I and elongated distal phalanges. This evolutionary novelty, and other synapomorphies, has led to the definition of a new clade, Macrocheiriformes, including Pelecanimimus and more derived ornithomimosaurs. Pelecanimimus has the only ossified sternal plates among ornithomimosaurs and the first evidence of uncinate processes in a non-maniraptoran theropod, indicating a convergent appearance of these structures in Coelurosauria. The character combination in an early-diverging ornithomimosaur like Pelecanimimus found in this analysis provides a key step in the evolution of the manus and pectoral girdle in Ornithomimosauria.

中文翻译:

Pelecanimimus (Theropoda: Ornithomimosauria) 颅后解剖学和鸟龙目特化手的进化和手盗龙类胸骨

Pelecanimimus polyodon 于 1993 年在西班牙 Barremian 化石遗址 Las Hoyas 被发现,是第一个从欧洲描述的鸟龙类。到目前为止,还没有详细的描述 Pelecanimimus 的正模标本,它由关节骨骼的前半部分组成。在这里,我们报告了对其颅后骨骼的新的、详细的、经过修订的和更准确的骨学描述,并将这些新数据与过去三年中有关鸟嘴龙类的信息进行了比较。对 Pelecanimimus 的这种骨学和系统发育分析显示了几种鸟龙类突触和独特的特征组合,可以修正其原始诊断。Pelecanimimus 在鸟嘴龙科早期分化并揭示了manus 的扩大趋势,与衍生的鸟嘴龙类共享,由于长的掌骨 I 和细长的远端指骨。这种进化上的新奇事物,以及其他的突触,导致了一个新的进化枝——Macrocheiriformes 的定义,包括 Pelecanimimus 和更多衍生的鸟龙类。Pelecanimimus 在鸟龙类中拥有唯一的骨化胸骨板,并且是非手盗龙类兽脚亚目中钩突的第一个证据,表明这些结构在 Coelurosauria 中会聚出现。在这项分析中发现的早期分化的似鸟龙(如 Pelecanimimus)中的特征组合为鸟嘴龙的手部和胸带进化提供了关键步骤。Pelecanimimus 在鸟龙类中拥有唯一的骨化胸骨板,并且是非手盗龙类兽脚亚目中钩突的第一个证据,表明这些结构在 Coelurosauria 中会聚出现。在这项分析中发现的早期分化的似鸟龙(如 Pelecanimimus)中的特征组合为鸟嘴龙的手部和胸带进化提供了关键步骤。Pelecanimimus 在鸟龙类中拥有唯一的骨化胸骨板,并且是非手盗龙类兽脚亚目中钩突的第一个证据,表明这些结构在 Coelurosauria 中会聚出现。在这项分析中发现的早期分化的似鸟龙(如 Pelecanimimus)中的特征组合为鸟嘴龙的手部和胸带进化提供了关键步骤。
更新日期:2021-02-23
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