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Vertebrata Palasiatica ›› 2019, Vol. 57 ›› Issue (3): 205-213.DOI: 10.19615/j.cnki.1000-3118.190425

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Metatarsal II osteohistology of Xixianykus zhangi (Theropoda: Alvarezsauria) and its implications for the development of the arctometatarsalian pes

QIN Zi-Chuan1,2,3, ZHAO Qi1,2, XU Xing1,2,3,*()   

  1. 1 Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Beijing 100044
    2 CAS Center for Excellence in Life and Paleoenvironment Beijing 100044
    3 University of Chinese Academy of Sciences Beijing 100049
  • Received:2019-03-26 Online:2019-07-20 Published:2019-07-20

张氏西峡爪龙(兽脚类:阿尔瓦雷斯龙类)第二跖骨的骨组织学及其对“窄足型”足部结构发育的启示

秦子川1,2,3, 赵祺1,2, 徐星1,2,3,*()   

  1. 1 中国科学院古脊椎动物与古人类研究所,中国科学院脊椎动物演化与人类起源重点实验室 北京 100044
    2 中国科学院生物演化与环境卓越创新中心 北京 100044
    3 中国科学院大学 北京 100049
  • 通讯作者: * xu.xing@ivpp.ac.cn
  • 基金资助:
    国家自然科学基金(41688103);国家自然科学基金(41120124002)

Abstract:

The late-branching alvarezsaurian Xixianykus zhangi is among the smallest known non-avialan theropods. With great similarity to its close relatives, it is highly cursorial as indicated by proportionally long lower segments of the hindlimbs and the presence of an arctometatarsalian pes-a highly modified structure that has been suggested to improve cursorial capability in theropods. Here we describe the osteohistology of the metatarsal II of the holotype of X. zhangi (XMDFEC V 0011). Two rarely reported histological features, radial vascular canals and Sharpey’s fibers, are presented in this study. We suggest that both features are related to the development of the arctometatarsalian pes; however, further investigations of metatarsal osteohistology in theropods are required for the validation of our interpretation.

Key words: Henan, Late Cretaceous, alvarezsaurian, osteohistology, arctometatarsalian, radial vascular canals, Sharpey’s fibers

摘要:

阿尔瓦雷斯龙类的一晚期演化支——张氏西峡爪龙(Xixianykus zhangi), 是体型最小的非鸟兽脚类恐龙之一。与其他阿尔瓦雷斯龙类类似,其胫跗骨和足部相对较长,并具有善于奔跑的兽脚类恐龙中常见的窄足型足部,指示其可能非常善于奔跑。对张氏西峡爪龙的第二跖骨进行了骨组织学研究,发现了两种罕见的骨组织学结构:放射状骨脉管和沙比纤维。认为这两种结构与其具有的窄足型足部有关,然而还需要对更多的兽脚类跖骨进行骨组织学研究来验证这一结论。

关键词: 河南省, 晚白垩世, 阿尔瓦雷斯龙类, 骨组织学, 窄足型足部, 放射状骨脉管, 沙比纤维

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