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New material of Anancus kenyensis (proboscidea, mammalia) from Toros-Menalla (Late Miocene, Chad): Contribution to the systematics of African anancines
Authors:Lionel Hautier   Hassane Taisso Mackaye   Fabrice Lihoreau   Pascal Tassy   Patrick Vignaud  Michel Brunet  
Affiliation:1. Department of Geosciences and Geography, PO Box 64, FI-00014, University of Helsinki, Finland;2. Natural History Museum, London, Cromwell Road, London SW7 5BD, UK;3. Norwegian Polar Institute, Fram Centre, NO-9296 Tromsø, Norway;4. Geological Survey of Finland, PO Box 96, FI-02151 Espoo, Finland;5. Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya 3, 664033 Irkutsk, Russia;6. Centre for Ecological and Evolutionary Synthesis, Dept. of Biosciences, University of Oslo, PO Box 1066, Blindern, NO-0316 Oslo, Norway;7. Department of Genetics, PO Box 56, FI-00014, University of Helsinki, Finland
Abstract:New fossil remains of the proboscidean genus Anancus are described. Among them, a complete skull allows us to revisit for the first time the entire Chadian Anancus fossil record. This genus occurred in the Old World from the late Miocene up to the early Pleistocene. The analysis of dental and cranial characters was allowed individual variations from specific characters to be distinguished. In this study we show that Anancus kenyensis and Anancus osiris are very likely synonym taxa which leads us to emend the diagnosis of A. kenyensis. In addition, this study shows that dental characters in anancines lineage are of little significance for biostratigraphical inference, by contrast to previous works. This study brings new data about the phylogenetical and palaeobiogeographical history of the African anancines.
Keywords:Anancus   Proboscidea   Chad   Toros-Menalla   Miocene   Systematics
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