Abstract

New bird taxa are described from the early Eocene Bumban Member of the Tsagaan-Khushuu locality in southern Mongolia. Bumbanortyx transitoria gen. et sp. nov. is a small galliform bird that combines morphological similarity with the fossil families Quercymegapodiidae and Gallinuloididae. The somewhat larger Bumbanipodius magnus gen. et sp. nov. also shows similarities with Quercymegapodiidae, but is close to Argillipes aurorum from the early Eocene of England in the structure of the tarsometatarsus. Bumbanipes aramoides gen. et sp. nov. shows the greatest similarity with modern Aramidae (Gruiformes). Bumbaniralla walbeckornithoides gen. et sp. nov. is described based on a coracoid, morphologically intermediate between those of Walbeckornis and Messelornithidae (stem Gruiformes). The presence of unnamed Messelornithidae in the fauna of the Tsagaan-Khushuu locality is also noted.

中文翻译：

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蒙古早始新世的新鸟类分类群（鸟类：鸡形目、灰形目）

摘要

新的鸟类分类群来自蒙古南部 Tsagaan-Khushuu 地区的早始新世 Bumban 成员。Bumbanortyx transoria gen。等 sp. 十一月 是一种小型鸡形鸟，结合了与 Quercymegapodiidae 和 Gallinuloididae 化石家族的形态相似性。稍大的Bumbanipodius magnus gen。等 sp. 十一月 也表现出与 Quercymegapodiidae 的相似之处，但在跗跖骨的结构上接近英格兰始新世早期的Argillipes aurum。Bumbanipes aramoides gen。等 sp. 十一月 显示出与现代 Aramidae (Gruiformes) 最大的相似性。野蜂鸟将军 等 sp. 十一月 描述基于喙突，形态介于Walbeckornis和 Messelornithidae（茎 Gruiformes）之间。还注意到在 Tsagaan-Khushuu 地区的动物群中存在未命名的 Messelornithidae。