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辽宁朝阳九佛堂组今鸟类(红山鸟科)一新属种

2011年第49卷 第2期: 195-200

发表日期:2011-05-30来源:放大 缩小

 

编辑:李莉,王晶琦,侯世林

摘要:记述了辽宁朝阳原家洼九佛堂组发现的原始今鸟类一新属种:朝阳副红山鸟(Parahongshanornis chaoyangensis gen. et sp. nov. )。尽管缺失头骨,但其头后特征和红山鸟及一件属于红山鸟科的长腿鸟最为接近,具有该科的一些明显鉴定特征,如前肢相对后肢十分短小,“U冶字形的叉骨长明显大于宽等,因此可以归入红山鸟科。新鸟在以下特征上可与红山鸟及长腿鸟相区别,如叉骨支近端侧向压扁,联合处有一条深沟;胸骨末端有两对后凹陷,在龙骨突与侧突之间有短的后突;第II 指第1 指节相对更加短粗,第2 指节细长;耻骨具有膨大的耻骨脚等。新材料的发现为红山鸟类提供了新的剖解学特征,还为研究早期今鸟类的多样性提供了新材料。

关键词:辽宁朝阳,早白垩世,九佛堂组,今鸟亚纲,新属种

卷期:49卷 02期

 

A new Ornithurine bird (Hongshanornithidae) from the Jiufotang Formation of Chaoyang, Liaoning, China

LI Li, Wang Jing-qi, Hou Shi-lin


Abstract 
A new genus and species (Parahongshanornis chaoyangensis) of a basal ornithurine bird from the Jiufotang Formation in Yuanjiawa Town, Chaoyang, western Liaoning Province is reported. It is morphologically most similar to the basal ornithurines Hongshanornis and Longicrusavis, two only known genera of the Hongshanornithidae by possessing a shorter wing compared to the leg and a “U”-shaped furcula that is significantly longer than wide. The new taxon can be distinguished from these two genera in having a furcula that is anteroposteriorly compressed proximally, with a deep groove along the clavicular symphysis, a sternum with two pairs of posterior excavations, and a pair of short posterior processes between the lateral trabecula and the medial ridge of the sternum, a short and robust first phalanx of the major digit, and a pubis with a distinctive pubic foot. The discovery of the new hongshanornithid from the Jiufotang Formation not only extends the temporal distribution of the Hongshanornithidae, but also provides new data for discussing the evolutionary differentiation of basal ornithurines in the Early Cretaceous.
Key words  Chaoyang, Liaoning; Early Cretaceous; Jiufotang Formation; Ornithurae; new genus and species

 

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