Tarsal morphology of the pleuraspidotheriid mammal Hilalia from the middle Eocene of Turkey
Tarsal morphology of the pleuraspidotheriid mammal Hilalia from the middle Eocene of Turkey
复制标题
土耳其始新世中期胸膜兽科哺乳动物Hilalia的跗骨形态
DOI：
10.4202/app.00314.2016
复制
发表时间：
2017
影响因子：
1.8
通讯作者：
K. Erturaç
中科院分区：
文献类型：
--
作者：
G. Métais;K. Beard;O. Erdal;K. Erturaç
Pleuraspidotheriids是一组原始的有蹄类哺乳动物，直到最近，被认为是仅限于西欧的古新世晚期。据推测，这个家族实际上在安纳托利亚中部生存到至少始新世中期。然而，这些不合时宜的年轻安纳托利亚“幸存者”，包括Hilalia属，以前主要通过牙齿遗骸记录。在这里，我们描述了以前未知的黄芪Hilalia saribeya，这证实了属的pleuraspidotherid的亲和力，并支持系统发育重建，把Hilalia的姐妹群Pleuraspidotherium。黄芪的形态表明H. Saribeya，尽管其跗骨形态仍然足够普遍，不能排除扫描能力。Hilalia的演变是在始新世的安纳托利亚中部明显的地理隔离的背景下解决的。始新世中期安纳托利亚中部哺乳动物区系的地方性特征强调了新特提斯北方边缘复杂的古地理如何影响了位于非常独特的古地理带十字路口的地区的当地生物多样性。
Pleuraspidotheriids are a group of primitive ungulate mammals that, until recently, were thought to be restricted to the late Paleocene of Western Europe. It has been hypothesized that this family actually survived in Central Anatolia until at least the middle Eocene. However, these anachronistically young Anatolian “survivors”, including the genus Hilalia, were previously documented mainly by dental remains. Here, we describe the previously unknown astragalus of Hilalia saribeya, which confirms the pleuraspidotheriid affinities of the genus, and supports phylogenetic reconstructions that place Hilalia as the sister group of Pleuraspidotherium. The morphology of the astragalus suggests sub-cursorial plantigrade locomotion for H. saribeya, although its tarsal morphology remains generalized enough that scansorial capabilities cannot be ruled out. The evolution of Hilalia is addressed in the context of the apparent geographic isolation of Central Anatolia during the Eocene. The endemic character of the mammalian fauna of Central Anatolia during the middle Eocene emphasizes how the complex paleogeography of the northern margin of Neotethys impacted local biotas in a region situated at the crossroads of very distinctive biogeographic zones.