Equidae Gray, 1821
Mesohippus bairdi
Mesohippus barbouri
Mesohippus cuneatus
Mesohippus exoletus
Mesohippus hypostylus
Mesohippus montanensis
Mesohippus propinquus
Mesohippus proteulophus
Mesohippus texanus
Mesohippus trigonostylus
Mesohippus westoni