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1. chinaXiv:201906.00027 [pdf]

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

QIN Zi-Chuan; ZHAO Qi; XU Xing
Subjects: Biology >> Zoology

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.

submitted time 2019-06-11 From cooperative journals:《古脊椎动物学报》 Hits2605Downloads450 Comment 0

2. chinaXiv:201906.00096 [pdf]

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

QIN Zi-Chuan; ZHAO Qi; XU Xing
Subjects: Biology >> Zoology

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.

submitted time 2019-06-11 From cooperative journals:《古脊椎动物学报》 Hits2305Downloads308 Comment 0

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