Les Périssodactyles (Mammalia) du Miocène de Lisbonne

Abstract

Key-words: Perissodactyla; Lower and Middle Miocene; Lisbon; Portugal. New data led us to revise Miocene Perissodactyla from Lisbon. Equids (Anchitheriun) have been described by Alberdi & González (1999); we fully agree with ther conclusions. On the other hand, the only Chalicotheriid cannot be clearly reported to any genus. It therefore will be led in open nomenclature (Schizotheriinae ind.). The Rhinocerotids have been described in detail (1983). We could recognize now that: Protaceratherium togicum is a synonym of P. minutum; Plesiaceratherium platyodon and Plesioceratherium lumiarense should be ascribed to the genus Plesiaceratherium and not to Acerotherium; there are no reasons for name changes as far as the forms previously referred as Diaceratherium aurellanensis, Prosantorhinus germanicus and Hispanotherium matritensis are concerned; as the genera Dicerorhinus and Lartetotherium are distinct, Diceforhinus (Lartetotherium) sansaniensis has to be named Lartetotherium sansaniensis; as Gaindatherium (lberotherium) rexmanueli cannot be reported to Gaindatherium, we therefore upgrade the subgenus lberotherium to the genus'rank - hence the names of the concemed taxa become lberotherium rexmanueli rexmanueli and I. rexmanueli zbyszewskii; Chilotherium ibericus is but a dental variation of I. rexmanueli zbyszewskii. The stratigraphic distribution and age of the Miocene Perissodactyla so far known in the Lower Tagus basin / Lisbon region are present.