Equus semplicatus was a Pleistocene species of New World stilt-legged horse,[2] and considered the type species for the stilt legged horses, one of three lineages of equids within the Americas,[3] the other two being hippidionid and caballine horses.

[4] Now extinct, Equus semiplicatus once inhabited North America.

[5] Fossils found William's Cave in Texas have been identified as Equus semiplicatus.

[5]