【摘要】 继1984年首次报道甘肃玉门昌马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背侧特征等;部分前肢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,趾爪短小且弯曲度小;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,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。更多还原

【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.更多还原