Revue de Paléobiologie, Genève (décembre 2018) 37 (2): 577-591 ISSN 0253-6730 Dental anatomy of the early hominid, Orrorin tugenensis, from the Lukeino Formation, Tugen Hills, Kenya Brigitte SENUT1,*, Martin PICKFORD2 & Dominique GOMMERY3 1 CR2P - Centre de Recherche en Paléontologie - Paris, MNHN - CNRS - Sorbonne Université, Muséum national d’Histoire naturelle, CP 38, 8, rue Buffon, F-75252 Paris cedex 05, France. E-mail: *
[email protected] 2 CR2P - Centre de Recherche en Paléontologie - Paris, MNHN - CNRS - Sorbonne Université, Muséum national d’Histoire naturelle, CP 38, 8, rue Buffon, F-75252 Paris cedex 05, France. E-mail:
[email protected] 3 CR2P - Centre de Recherche en Paléontologie - Paris, CNRS - MNHN - Sorbonne Université, Campus Pierre et Marie Curie - Jussieu, T. 46 - 56, E.5, Case 104, F-75252 Paris cedex 05, France. E-mail:
[email protected] Abstract Subsequent to the initial publication of the Late Miocene hominid genus and species, Orrorin tugenensis, in 2001, additional dental remains were discovered which comprise the subject of this paper. Detailed descriptions of all the Orrorin fossils are provided and comparisons are made with other late Miocene and early Pliocene hominoid fossils, in particular Ardipithecus ramidus, Ardipithecus kadabba and Sahelanthropus tchadensis. The Late Miocene Lukeino Formation from which the remains of Orrorin were collected, has yielded rare remains of a chimpanzee-like hominoid as well as a gorilla-sized ape. Although comparisons with Ardipithecus ramidus are difficult due to the fact that measurements of the teeth have not been published, it is concluded thatAr. ramidus is chimpanzee-like in several features, whereas some of the Ardipithecus kadabba fossils are close to Orrorin (others are more chimpanzee-like).