CAJ | 학술논문

玉门甘肃鸟(Gansus yumenensis)是中国发现的第一只中生代鸟类化石.该化石产自甘肃西北部下沟组,时代与辽宁西部产热河生物群的早白垩世地层的时代大体相当.该鸟类趾节拉长,很短的爪具有较尖锐的屈肌结节,因而被认为是一种适应于水生生活的鸟类.玉门甘肃鸟的建立最初仅依据一件左足标本,直到最近又发现了少量可供进一步研究的新标本.本文描述了一件新的玉门甘肃鸟的完整后肢化石,标本在远端趾节之间显示出清晰的蹼的构造.这为玉门甘肃鸟具有发育足蹼的观点提供了最直接的证据.玉门甘肃鸟也成为世界上已知最古老的适应于水生生活环境的鸟类.
옥문감숙조(Gansus yumenensis)시중국발현적제일지중생대조류화석.해화석산자감숙서북부하구조,시대여료녕서부산열하생물군적조백성세지층적시대대체상당.해조류지절랍장,흔단적조구유교첨예적굴기결절,인이피인위시일충괄응우수생생활적조류.옥문감숙조적건립최초부의거일건좌족표본,직도최근우발현료소량가공진일보연구적신표본.본문묘술료일건신적옥문감숙조적완정후지화석,표본재원단지절지간현시출청석적복적구조.저위옥문감숙조구유발육족복적관점제공료최직접적증거.옥문감숙조야성위세계상이지최고로적괄응우수생생활배경적조류.
Gansus yumenensis is the first Mesozoic bird found in China. It was collected from the Xiagou Formation in northwestern Gansu, which is considered to be equivalent to the Early Cretaceous strata yielding the Jehol biota in western Liaoning. Based on some characters such as elongated phalanges and short claws with pointed flexor tubercles, Gansus yumenensis is regarded as the bird adapted to life in the aquatic environment. Gansus yumenensis was originally erected only based on a unique specimen of the left pes, and some specimens have been found for a further study recently. In this paper, a newly discovered complete hindlimb of Gansus yumenensis is described, which shows the clear webbed structures among the distal portions of pedal phalanges. It is the first direct evidence to show that Gansus yumenensis with well-developed footwebs is really the oldest known bird specifically well-adapted to life in the aquatic environment in the world.