A SUBADULT SPECIMEN OF THE EARLY CRETACEOUS BIRD SAPEORNIS CHAOYANGENSIS AND A TAXONOMIC REASSESSMENT OF SAPEORNITHIDS
A SUBADULT SPECIMEN OF THE EARLY CRETACEOUS BIRD SAPEORNIS CHAOYANGENSIS AND A TAXONOMIC REASSESSMENT OF SAPEORNITHIDS
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DOI：
10.1080/02724634.2012.693865
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发表时间：
2012-01-01
影响因子：
1.4
通讯作者：
Walsh, Maureen O.
中科院分区：
文献类型：
--
作者：
Gao, Chunling;Chiappe, Luis M.;Walsh, Maureen O.
本文描述了辽宁省早白垩世朝阳沙鸟（Sapeornis chaoyangensis）亚成体新标本的骨骼解剖和显微结构。迄今为止，这是唯一已知的保存了大部分羽毛的sapeornithid。发现于义县组，它也是已知最古老的sapeornithid，因此，延长了这个谱系的地层范围300万至500万年。这个标本也增加了我们对隐鸟龙骨骼和外皮解剖的了解，包括以前未被认识的初级和次级翅膀羽毛的细节。检查用于诊断其他命名sapeornithid物种的字符显示，这种诊断已纳入形态的影响，无论是埋藏或个体发育。通过对新标本与其他隐鸟科种类的定性和定量比较，我们认为所有已命名的隐鸟科都是S.朝阳草
We describe the anatomy and bone microstructure of a new subadult specimen of Sapeornis chaoyangensis from the Early Cretaceous of Liaoning Province, China. To date, this is the only known sapeornithid that preserves substantial portions of its plumage. Found in the Yixian Formation, it also represents the oldest known sapeornithid, and as such, extends the stratigraphic range of this lineage 3-5 million years. This specimen also increases our knowledge of sapeornithid skeletal and integumentary anatomy, including previously unrecognized details of the primary and secondary wing feathers. Examination of the characters used to diagnose other named sapeornithid species reveals that such diagnoses have incorporated morphologies that are influenced by either taphonomy or ontogeny. Based on qualitative and quantitative comparisons between the new specimen and other sapeornithid species, we argue that all other named sapeornithids are junior synonyms of S. chaoyangensis.