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首页> 外文期刊>Acta Palaeontologica Polonica >Reassessment of the generic attribution of Numidotherium savagei and the homologies of lower incisors in proboscideans
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Reassessment of the generic attribution of Numidotherium savagei and the homologies of lower incisors in proboscideans

机译：重新评估长鼻猿Namimidotherium savagei的一般归因和下切牙的同源性

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摘要

Near the end of the twentieth century, a medium-sized early proboscidean found in Dor El Talha (late Eocene to early Oligocene), Libya, originally identified as a small species of Barytherium, was described as a new species of Numidotherium and designated Numidotherium savagei. Poorly known, this taxon has been excluded from most of the recent debate about the origin and diversification of the order Proboscidea. New specimens described herein show strong structural similarities of the upper teeth with those of bunolophodont early proboscideans (e.g., Moeritherium and Phiomia) and document the shared presence of derived traits in the postcranial skeleton. The newly referred material also demonstrates some unique characteristics of this taxon, notably in its mandibular morphology and the microstructure of its dental enamel. Included for the first time in a cladistic analysis (207 anatomical characters applied to all early tethytheres), N. savagei is distinct from both Numidotherium and Barytherium, and lies in an "intermediate" position between the strictly lophodont Eocene proboscideans and the bunolophodont moeritheres and elephantiforms. Accordingly, the species is herein referred to a new genus, Arcanotherium. New data on its mandibular symphysis and, especially, on its lower incisors loci and morphology, bring new support to a hypothesis of homology between the lower incisors of early proboscideans and the ever-growing lower tusks of the elephantiforms, which are identified here as di 1 and i1.
机译：大约在20世纪末，在利比亚的Dor El Talha（始新世至早渐新世）中发现了一个中等大小的早长前鞭毛虫，最初被确定为重金属钡菊的一小种，被描述为一种新的Numidotherium，并被命名为Savusi。 。众所周知，这个分类单元已被排除在最近关于Proboscidea目的起源和多样化的大多数辩论中。本文所述的新标本显示了上齿与Bunolophodont早期长喙sc科动物（例如Moeritherium和Phiomia）的上颌骨有很强的结构相似性，并记录了颅后骨骼中共有衍生特征。新提及的材料还展示了该分类单元的一些独特特征，特别是在其下颌形态和其牙釉质的微观结构方面。鼠尾草猪笼草首次被包括在一次进化分析中（207个解剖特征应用于所有早期的tethytheres），与Numidotherium和Barytherium均不同，并且位于严格的始新世始新世的长新壳虫和buunolophodont mo虫之间，处于“中间”位置。象形。因此，该物种在本文中被称为新属Arcanotherium。关于其下颌联合的新数据，尤其是其下门牙的位点和形态的新数据，为早期长喙蝶的下门牙与不断增长的象牙下象牙之间的同源性假说提供了新的支持。 1和i1。

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