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1 March 2008 New Hippotragini (Bovidae, Mammalia) from the Late Miocene of Toros-Menalla (Chad)
Denis Geraads, Cecile Blondel, Andossa Likius, Hassane Taisso Mackaye, Patrick Vignaud, Michel Brunet
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Abstract

Until now, the pre-Pleistocene record of the bovid tribe Hippotragini was rather poor. Two new taxa are described from the late Miocene of Toros-Menalla in northern Chad, which yielded the earliest known hominid, Sahelanthropus tchadensis. Tchadotragus sudrei n.gen. n.sp. is known by complete skulls and numerous horn-cores. It has typical hippotragine features such as long slender, curved horn-cores, weak cranial flexure, large frontal sinus, and hippotragine-like dentition, and is here taken as a basal member of the tribe, branching before the divergence between Oryx-Praedamalis and Hippotragus s.l. Saheloryx solidus n.gen. n.sp. is less well-known; it differs mainly by the lack of sinus in the frontal and horn-cores, shorter horn-cores, and rounded brain-case, but it shares with Tchadotragus a large number of features that prompt us to classify it also at the base of the hippotragine tree, perhaps as the sister-taxon of Tchadotragus. No other African taxon looks like Saheloryx, and the only one similar to Tchadotragus is from Sahabi, Libya. The abundance of hippotragines sharply distinguishes Toros-Menalla from the East African late Miocene bovid faunas.

Denis Geraads, Cecile Blondel, Andossa Likius, Hassane Taisso Mackaye, Patrick Vignaud, and Michel Brunet "New Hippotragini (Bovidae, Mammalia) from the Late Miocene of Toros-Menalla (Chad)," Journal of Vertebrate Paleontology 28(1), 231-242, (1 March 2008). https://doi.org/10.1671/0272-4634(2008)28[231:NHBMFT]2.0.CO;2
Accepted: 26 July 2007; Published: 1 March 2008
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