Abstract
Three fragmentary maxillae and an isolated upper molar from the Upper Eocene locality of Wai Lek (Krabi Basin, South Thailand) belonging to the small anthracotheriid Siamotherium krabiense display strongly abnormal morphologies that are particularly unusual among the dental anomalies recorded in both extant and fossil mammals. Variation and atavism can be ruled out, and the other hypothetical origins of these anomalies, particularly the occurrence of odontomes and inbreeding, are discussed.Dental anomalies, Anthracotheriidae, Asia, atavism, variation, inbreeding. Stephane Ducrocq and Jean-Jacques Jaeger, Laboratoire de Paleontologie, Institut des Sciences de l'Evolution, Case Courrier 064, Universite Montpellier II, Place Eugene Bataillon, F-34095 Montpellier Cedex 5, France (SD's current address: Staatliches Museum fur Naturkunde, Rosenstein 1, D-70191 Stuttgart, Germany); Yaowalak Chaimanee and Varavudh Suteethorn, Department of Mineral Resources, Geological Survey, Rama VI Road, Bangkok 10400, Thailand; 14th November, 1994; revised 27th July. 1995.
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