Evolution of the hallux in non-avian theropod dinosaurs

DOI Web Site 参考文献37件
  • Soki Hattori
    Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan,

書誌事項

公開日
2016-03-22
資源種別
journal article
DOI
  • 10.1080/02724634.2016.1116995
公開者
Informa UK Limited

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説明

ABSTRACT The emergence of a reversed hallux (first pedal digit) in the theropod lineage is regarded as an important indicator of increasing grasping ability and possibly arboreality. However, functions of the pes with a plesiomorphic, nonreversed hallux in non-avian theropods, other than the major role in supporting and propelling the body during the stance phase, have not been fully addressed. To clarify hallucal function, 21 specimens of non-avian theropods were examined in this study. Ancestrally in Theropoda, the proximal end of the first metatarsal reached the ankle joint as in extant crocodilians. The size of the first metatarsal was then reduced, lost direct contact with the ankle joint, and shifted more plantarly in basal neotheropods. In articulated coelophysoid specimens, the proximal end of the first metatarsal attaches to the medioplantar margin of the second metatarsal, whereas the distal part of the first metatarsal and phalanges of the hallux lies on the plantar aspect of the pes. In four a...

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