New strepsirrhine primate from the late Eocene of Peninsular Thailand (Krabi Basin)

被引:15
|
作者
Marivaux, Laurent
Chaimanee, Yaowalak
Tafforeau, Paul
Jaeger, Jean-Jacques
机构
[1] Univ Montpellier 2, Inst Sci Evolut Montpellier, ISEM, CNRS,UMR 5554,Lab Paleontol, F-34095 Montpellier 05, France
[2] Dept Mineral Resources, Bur Geol Survey, Paleontol Sect, Bangkok 10400, Thailand
[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France
关键词
Paleogene; South Asia; Krabi Basin; adapiform primates; dental morphology; microtomography;
D O I
10.1002/ajpa.20376
中图分类号
Q98 [人类学];
学科分类号
030303 ;
摘要
In this paper, we describe the newly discovered lower jaw of a primate from the late Eocene Krabi coal mine (Bang Mark pit) of Peninsular Thailand. We performed microtomographic examinations at the European Synchrotron Radiation Facility (ESRF, Grenoble, France) to analyze different morphological aspects of the jaw and teeth. Although partially preserved, this fossil mandible reveals a set of distinctive dental traits (e.g., double-rooted P-2 and molarized P-4) that allow us to describe a new stepsirrhine adapiform: Muangthanhinius siami, new genus and species. This taxon is somewhat atypical among Paleogene adapiforms, and more specialized than the sivaladapid adapiforms (hoanghoniines) that existed in Asia in the same epoch. In fact, Muangthanhinius shows a degree of dental specialization approximating that of some modern strepsirrhine lemuriforms, although it lacks the highly specialized anterior dentition characterizing this living primate group (canine + incisors forming a very procumbent toothcomb). In contrast, Muangthanhinius exhibits a large canine deeply anchored within the dentary that probably protruded high above the toothrow. Finally, despite the development of a molarized P-4 as in Miocene sivaladapid sivaladapines, Muangthanhinius differs in molar morphology from this group, and the position of this new taxon within the Adapiformes remains indeterminate. Clarification of its phylogenetic position will require more morphological evidence than is currently available.
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页码:425 / 434
页数:10
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