A carpometacarpus from the upper cretaceous of patagonia sheds light on the Ornithurine bird radiation
A carpometacarpus from the upper cretaceous of patagonia sheds light on the Ornithurine bird radiation
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DOI：
10.1007/s12542-011-0112-2
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发表时间：
2012-03-01
影响因子：
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通讯作者：
Novas, Fernando E.
中科院分区：
文献类型：
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作者：
Agnolin, Federico L.;Novas, Fernando E.
我们报告了在阿根廷里奥内格罗省Salitral Moreno的上白垩统艾伦组（Campanian-Maastrichtian）中发现的一个孤立的鸟类carpometacarpus。该样本参考cf.新鸟类，因为它提出了一个明显的，但浅的下颌下窝，缩短腹缘的腕trophila不接触基地的伸肌过程，和伸肌过程明显超过颅侧关节面为第一趾。该标本的孤立性质排除了它在主要新鸟氨酸谱系中的包含。虽然它可能代表了新鸟类冠部分支的一部分，但有限的数据并不能肯定地支持任何特定谱系的位置。腕足类是南美洲少数几种中生代类鸟的记录之一。
We report the discovery of an isolated avian carpometacarpus from the Upper Cretaceous Allen Formation (Campanian-Maastrichtian), Salitral Moreno, Rio Negro Province, Argentina. This specimen is referred to cf. Neornithes because it presents a distinct but shallow infratrochlear fossa, a shortened ventral rim of the carpal trochlea that does not contact the base of the extensor process, and an extensor process conspicuously surpassing cranially the articular facet for digit I. The isolated nature of the specimen precludes its inclusion within the main neornithine lineages. Although it may represent part of the crown clade Neornithes, the limited data available do not confidently support placement within any particular lineage. The carpometacarpus constitutes one of the few records of Mesozoic Neornithine-like birds for South America.