A Lower Jaw of Pondaungia Cotteri from the Late Middle Eocene Pondaung Formation (Myanmar) Confirms Its Anthropoid Status
A lower jaw of Pondaungia cotteri from the Late Middle Eocene Pondaung Formation (Myanmar) confirms its anthropoid status Yaowalak Chaimanee*, Tin Thein†, Ste´ phane Ducrocq‡, Aung Naing Soe§, Mouloud Benammi‡, Than Tun¶, Thit Lwin§, San Wai¶, and Jean-Jacques Jaeger‡ʈ *Department of Mineral Resources, Geological Survey Division, Paleontological Section, Rama VI Road, Bangkok 10400, Thailand; ‡Institut des Science de l’Evolution, Universite´Montpellier-II, Centre National de la Recherche Scientifique, 064, 34095 Montpellier Cedex 5, France; †Department of Geology, University of Pathein, Pathein, Myanmar; §Geology Department, University of Yangon, Yangon, Myanmar; and ¶Office of Strategic Studies, Ministry of Defense, Yangon, Myanmar Communicated by F. Clark Howell, University of California, Berkeley, CA, January 20, 2000 (received for review June 1, 1999) Pondaungia cotteri is the largest primate known from the Late NMMP 17 (Fig. 1) is a right lower jaw with complete hori- Middle Eocene Pondaung Formation, Myanmar. Its taxonomic zontal ramus and the beginning of the vertical ramus, bearing status has been the subject of much debate because of the alveoli for the second incisor and canine, three complete pre- fragmentary nature of its remains. Initially described as an anthro- molars, and three molars. The second and third molars are poid, some authors recently have associated it with adapid pri- similar to P. cotteri (NMMP 1, 3, and 5) in morphology and size mates. These debates have been fueled not only by the incom- (2, 3); therefore, NMMP 17 is referred to as that species. pleteness of the fossils attributed to Pondaungia but also by the The jaw is massive with an extremely robust horizontal ramus, reticence of many authors to regard Asia as an important evolu- a deep mandibular corpus, and a thick superior mandibular tionary theater for Eocene anthropoids.
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