Wiktionary
litoptern
n. (context zoology English) Any of several extinct hoofed mammals, of the order (taxlink Litopterna order noshow=1), from the Cenozoic period
Usage examples of "litoptern".
The group called the litopterns are almost unbelievably similar to horses in their legs, yet they were utterly unrelated to horses.
In Chapter 4 we saw that an Argentinian taxonomist had pronounced the litopterns ancestral to true horses, whereas they are now thought to be convergent on true horses.