Diceros (Greek: "two" (dio), "horn" (keratos)) is a genus of rhinoceros containing the living black rhinoceros (Diceros bicornis) and at least one extinct species. Taxonomy Diceros is generally believed to have branched off from an early species of Ceratotherium, specifically C. neumayri. 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. References External links Rhinoceroses Mammal genera Mammal genera with one living species Taxa named by John Edward Gray Taxa described in 1821