Résumé
More than 120 rhinocerotid remains unearthed in the middle Turolian locality of Akka ș dag ı(Central Anatolia) are described. The fauna is diversified, with a pair of large two-horned species, Ceratotherium neumayri (Osborn, 1900) and Stephanorhinus pikermiensis (Toula, 1906), and two smaller species of short limbed aceratheriines (Chilotherium sp. and Acerorhinus sp.). Ceratotherium neumayri is by far the most common species, with a complete skull, 114 specimens and at least 11 individuals. The cranial, dental and postcranial remains of C. neumayri are among the largest ones described so far for this species. The coexistence of C. neumayri , S. pikermiensis ,a nd chilotheres is common in the Turolian of Eastern Mediterranean: comparable rhinocerotid associations are known at Kavakdere (MN 12, Turkey) and Samos (MN 12, Greece). The large size of the C. neumayri specimens is consistent with the middle Turolian age for Akka ș dag˘ı(MN 12), as stated on the whole mammalian fauna and radiometric data. RÉSUMÉ Rhinocerotidae (Mammalia, Perissodactyla) du Miocène supérieur d'Akka ș dag ı, Turquie. Plus de 120 restes de rhinocérotidés découverts dans le gisement Turolien moyen d'Akka ș dag ı (Anatolie centrale) sont décrits. La faune est diversifiée, avec deux espèces de grands rhinocéros bicornes, Ceratotherium neumayri (Osborn, 1900) et Stephanorhinus pikermiensis (Toula, 1906), et deux espèces