Sinotherium
Sinotherium ("Chinese Beast") is an extinct genus of single-horned elasmotheriine rhinocerotids that lived from the late Miocene (Tortonian - Messinian) to Early Pliocene. It was ancestral to Elasmotherium, demonstrating a very important evolutionary transition from nasal-horned elasmotheriines to frontal-horned elasmotheriines.