litoptern
/lɪˈtɒptɜːn/noun
1- an extinct South American hoofed mammal resembling a horse or camel, found from the Palaeocene to the pleistocene epochs滑距骨兽。
1.1
- Order Litopterna: several families滑距骨目：数科。
词源
early 20th cent.: from modern Latin Litopterna, from Greek litos 'smooth' + pternē 'heel bone'.