Diceros (Greek: "two" (dio), "horn" (keratos)[1]) is a genus of rhinoceros containing the living black rhinoceros (Diceros bicornis) and at least one extinct species.[2]
Diceros is generally believed to have branched off from an early species of Ceratotherium, specifically C. neumayri.[3] However an even older species than C. neumayri from the Miocene has been placed in Diceros (D.australis). D. praecox is considered the direct ancestor of the black rhinoceros.