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伤齿龙标本IVPP V 10597分类学重新讨论

2012年第50卷 第2期: 140-150

发表日期:2012-04-23来源:放大 缩小

编辑:    舒柯文谭庆伟Martin SANDER, 马檠宇

摘要:保存部分后肢的标本IVPP V 10597最初被描述为蒙古蜥鸟龙(Saurornithoides mongoliensis)的幼年个体,但存在一些疑问。近年来有关伤齿龙科(Troodontidae)的研究,尤其是有关伤齿龙类分类学研究取得了重要进展,因此有必要对该标本的分类学重新进行评估。通过细致的形态比较和数值化的系统发育分析,确认相对于蒙古蜥鸟龙,V 10597更加接近于同域的谭氏临河猎龙(Linhevenator tani), 指示其有可能代表谭氏临河猎龙的幼年个体。但V 10597的许多后肢特征,包括许多涉及后肢骨骼间比例的特征,显示出与包括谭氏临河猎龙在内的其他伤齿龙类的明显区别。这些形态差异可能具有分类学意义,表明V 10597代表一个新种。通过骨组织学分析,确认该标本不可能代表谭氏临河猎龙或者其他大型伤齿龙类的幼年个体。基于已有的形态学和骨组织学信息,将V 10597定为一新属、新种,命名为柯瑞氏菲利猎龙(Philovenator curriei gen. et sp. nov.)。这一发现增加了白垩纪晚期伤齿龙类的种群分异度和形态差异度。

关键词:内蒙古,晚白垩世,伤齿龙类,后足形态,骨组织学

卷期:50 02

 

THE TAXONOMY OF THE TROODONTID IVPP V 10597 RECONSIDERED

XU Xing, ZHAO Qi, Corwin Sullivan, TAN Qing-wei, Martin SANDER, MA Qing-yu


Abstract
  The partial troodontid hindlimb IVPP V 10597 was originally described as a juvenile Saurornithoides mongoliensis. The present study reconsiders the taxonomic placement of this interesting specimen, given the significant advances in understanding of the Troodontidae that have taken place since it was first described. Morphological comparisons and numerical phylogenetic analyses indicate that V 10597 is more closely related to the sympatric Linhevenator tani than to Saurornithoides mongoliensis, raising the possibility that V 10597 might be a juvenile L. tani. However, V 10597 differs significantly from other troodontids, including L. tani, in numerous hindlimb features and particularly in the proportions of various hindlimb elements. These differences are likely to be taxonomic, and suggest that V 10597 represents a new troodontid. Furthermore, histological analysis indicates that V 10597 is unlikely to be a juvenile of L. tani or any other large troodontid. Based on the available morphological and histological information, we propose the erection of a new taxon, Philovenator curriei gen. et sp. nov., based on V 10597. This new find increases the known taxonomic diversity and morphological disparity of Late Cretaceous troodontids.
Key words  Nei Mongol, Late Cretaceous, Troodontidae, pedal morphology, histology

 

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