The facial skeleton of the early Oligocene colodon (perissodactyla, tapiroidea)
The facial skeleton of the early Oligocene colodon (perissodactyla, tapiroidea)
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发表时间：
2005-11
影响因子：
2
通讯作者：
M. Colbert
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作者：
M. Colbert
来自南达科他州怀特河群的两个渐新世早期Colodon的头骨比之前报道的要多得多。特别是，面部骨骼和鼻甲区的形态令人惊讶地现代，包括一个深深向后缩的鼻尖切迹，以及其他可卷曲的鼻骨发育的迹象。高分辨率的X射线计算机断层扫描被用来探索这些舌状突的内部解剖，发现了额窦和接近现代舌状突的内部面部骨骼。这不仅表明这些解剖条件的起源比以前记录的更早，而且在系统发育的背景下表明Colodon与Tapirus的亲缘关系比Proapirus更近。马修·W·科尔伯特。德克萨斯州奥斯汀大学杰克逊地球科学学院，地质科学系，1大学站C1100，邮编：78712-0254USA@mail.utexas.edu
Two skulls of the early Oligocene Colodon from the White River Group in South Dakota are much more derived than previously reported. In particular, morphologies of the facial skeleton and narial region are surprisingly modern, including a deeply retracted nasoincisive incisure, and other indicators of prehensile proboscis development. High-resolution X-ray computed tomography was used to explore the internal anatomy of these tapiroids, and revealed frontal sinuses, and an internal facial skeleton approaching that of modern tapirs. This not only indicates an earlier origin for these anatomical conditions than previously recorded, but in a phylogenetic context indicates that Colodon is more closely related to Tapirus than is Protapirus. Matthew W. Colbert. The Jackson School of Geosciences, The University of Texas at Austin, Geological Sciences Department, 1 University Station C1100, Austin, Texas 78712-0254 USA colbert@mail.utexas.edu