A NEW ORNITHURINE BIRD(HONGSHANORNITHIDAE)FROM THE JIUFOTANG FORMATION OF CHAOYANG,LIAONING,CHINA
A NEW ORNITHURINE BIRD(HONGSHANORNITHIDAE)FROM THE JIUFOTANG FORMATION OF CHAOYANG,LIAONING,CHINA
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发表时间：
2011
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通讯作者：
Li Li-Li;Wang Jing
中科院分区：
文献类型：
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作者：
Li Li-Li;Wang Jing
报道了辽西朝阳袁家洼镇九佛塘组一新属一新种(Parahongshanornishayangensis)。这两个新分类群在形态上与红山鸟科仅有的两个属--红山鸟属和长鸟属最为相似，因为它们的翅膀比腿短，有一个明显长于宽的U形柄。新分类群与这两个属的区别在于，它有一个向前压缩的柄，沿着锁骨联合有一深沟，胸骨有两对后方凹槽，以及在外侧小梁和胸骨内侧脊之间有一对短的后方突起，大指头的第一指骨短而粗壮九佛塘组新发现的红山鸟类不仅扩大了红山鸟科的时间分布，而且为探讨早白垩世基鸟鸟的进化分化提供了新的资料。
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 anteropcsteriorly 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.