The Face of Siamopithecus: New Geometric‐Morphometric Evidence for Its Anthropoid Status
The Face of Siamopithecus: New Geometric‐Morphometric Evidence for Its Anthropoid Status
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暹罗古猿的面孔：其类人猿地位的新几何形态测量证据
DOI：
10.1002/ar.20998
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
J. Jaeger
中科院分区：
文献类型：
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作者：
C. Zollikofer;Marcia S. Ponce de León;Y. Chaimanee;Renaud Lebrun;P. Tafforeau;Sasidhorn Khansubhaand;J. Jaeger
两栖类在亚洲早期灵长类动物进化中占有重要地位。在这里，我们报道了泰国甲米（Krabi）晚始新世两栖灵长类动物Siamopithecus eocaenus的新颌面和相关下颌遗骸，这是目前属于该类群最完整的标本。我们使用同步加速器显微断层扫描和虚拟重建技术来恢复标本的三维形态。对重建标本进行几何形态分析，将其与近期和化石灵长类动物样本进行比较，明确地将Siamopithecus与类人猿联系起来。像现代类人猿一样，暹罗古猿的脸相对较短，眼眶高度汇聚，眼眶的下边缘远高于牙槽面。类人猿特征和经典类人猿牙齿特征在同一个体中同时出现，为类人猿的地位提供了强有力的证据。因此，两栖类动物是与类人猿表现出完全趋同的特化适应动物是极不可能的。Anat Rec, 2009。©2009 Wiley‐Liss, Inc。
Amphipithecids assume a key position in early primate evolution in Asia. Here we report on new maxillofacial and associated mandibular remains of Siamopithecus eocaenus, an amphipithecid primate from the Late Eocene of Krabi (Thailand) that currently represents the most complete specimen belonging to this group. We used synchrotron microtomography and techniques of virtual reconstruction to recover the three‐dimensional morphology of the specimen. Geometric‐morphometric analysis of the reconstructed specimen within a comparative sample of recent and fossil primates clearly associates Siamopithecus with the anthropoids. Like modern anthropoids, Siamopithecus displays a relatively short face and highly convergent and frontated orbits, the lower rim of which lies well above the alveolar plane. The cooccurrence of spatially correlated anthropoid features and classical anthropoid dental characters in one individual represents a strong argument to support the anthropoid status of Siamopithecus. It is, thus, highly unlikely that amphipithecids are specialized adapiforms exhibiting complete convergence with anthropoids. Anat Rec, 2009. © 2009 Wiley‐Liss, Inc.