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古脊椎动物学报 ›› 2011, Vol. 49 ›› Issue (4): 435-445.

• 古脊椎动物学报 • 上一篇    下一篇

甘肃鸟的新材料及其解剖和行为习性的补充研究

李 岩,张玉光,周忠和,李志恒,刘 迪,汪筱林   

  • 出版日期:2011-12-15 发布日期:2011-12-15

NEW MATERIAL OF GANSUS AND A DISCUSSION ON ITS HABIT

LI Yan, ZHANG Yu-Guang, ZHOU Zhong-He, LI Zhi-Heng, LIU Di, WANG Xiao-Lin   

  • Published:2011-12-15 Online:2011-12-15

摘要: 继1984年首次报道甘肃玉门昌马地区发现的早白垩世甘肃鸟及2006年记述多件甘肃鸟标本以来,再次对发现于2004~2006年间的9件甘肃鸟标本进行形态的详细观察,补充描述甘肃鸟新的骨骼特征,包括侧面保存的胸骨,有较完整的镰刀形龙骨突及胸骨的背侧特征等;部分前肢的骨骼上有位于关节位置、呈短长方形的尺腕骨和桡腕骨;指式“2−3−1”, 小指骨的爪节完全退化消失;后肢各趾中第1趾节最长,趾爪短小并弯曲度小;第I趾相对较短、细弱,与其他趾相对握;第III趾粗壮,略短于第IV趾。在胫跗骨和跗跖骨关节处保存有鳞片状的皮肤印痕,趾骨间有蹼的印痕。通过指示性骨骼测量的三元分析,得出甘肃鸟是一类善飞的潜水鸟类,其习性接近于部分现生的鸭科成员,与之前有关甘肃鸟生活习性的推测较为接近。

Abstract: Some newly discovered postcranial material of Gansus yumenensis are described, adding to our understanding of the skeletal anatomy of this basal ornithurine. Such anatomical features include a laterally exposed sternum with a sickle-shaped keel, the ulnare with small metacarpal incision, complete loss of ungual of the minor digit, and manual phalangeal formula of “2−3−1”, as well as some more detailed features of the leg bones. The new material not only provided additional evidence of interdigital web but also preserved some scale-like skin impressions near the joint between the tibiotarsus and tarsometatarsus. A statistic analysis of the measurements of the sternum and major elements of the leg of Gansus further supports the hypothesis that this bird was a volant and diving bird, similar to that of extant ducks.