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邢立达的恐龙频道

沉闷的午夜时分,我脆弱而困倦时,在被人遗忘的荒野上,有太多离奇古怪的东西..

 
 
 

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古生物学者,科普作家. 现就读于加拿大阿尔伯塔大学生命科学系,为古生物学方向研究生,方向为恐龙,翼龙等中生代脊椎动物化石,足迹及其功能形态学,已发表论文多篇,描述了一批新物种。科普作家协会会员,已出版科普书籍约40本,同时为多家杂志撰稿,还在《新发现》等杂志设有专栏,并多次在CCTV各频道为公众介绍古生物知识。联系方式与个人主页: http://www.xinglida.net/

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Pedal function in deinonychosaurs (Dinosauria: The  

2009-04-14 09:48:50|  分类: 科研时光机 |  标签: |举报 |字号 订阅

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Senter, P. 2009. Pedal function in deinonychosaurs (Dinosauria:Theropoda):
a comparative study. Bulletin of the Gunma Museum of NaturalHistory
13:1-14.

ABSTRACT: Members of the Cretaceous theropod cladeDeinonychosauria have a
highly modified second toe with an enlarged, recurved ungual. HereI present
the first comparative study of pedal function in deinonychosaursand other
theropods to test hypotheses of function for this toe. Imanually
manipulated bones and casts to determine pedal range of motion inthe
non-deinonychosaurian theropods Dilophosaurus, Allosaurus,Mononykus, and
Chirostenotes; and the deinonychosaurs Troodon, Neuquenraptor,Rahonavis,
Bambiraptor, Deinonychus, and Dromaeosaurus. I also used movies ofwalking
bird feet for comparison. The results of the study show that: (1)contrary
to previous suggestions, the distodorsal eminence of pedal phalanxII-1 of
deinonychosaurs is not correlated with greater hyperextensibilityof phalanx
II-2 than in other theropods; (2) the proximoplantar process ofphalanx II-2
of deinonychosaurs limits flexion, as previously suggested (3)movement of
the second toe is sub-orthal in dromaeosaurids, the toe remainsadducted
(angled toward the animal's midline) through hyperextension andflexion in
Troodon, and in other theropods the second and fourth toes divergeduring
hyperextension and converge during flexion; (4) pedal phalanx I-1is
immobile in Chirostenotes and the examined deinonychosaurs but hasa wide
range of motion in other theropods; (5) contrary to a previoussuggestion,
the hallux of Rahonavis was not retroverted; (6) range of motion inthe
second toe is consistent with opening tough insect nests indromaeosaurids
but not Troodon; (7) the deinonychosaurian second toe washyperextended, not
flexed, during locomotion.

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