Nannippus is an extinct genus of horse endemic to North America during the Miocene through Pliocene, ~13.3—3.3 Ma, living approximately 11.1 million years.
Nannippus lived as far south as Central Mexico (N. peninsulatus) to as far north as Canada (N. lenticularis), to California in the west, North Carolina (N. lenticularis) and Florida (N. peninsulatus) in the east.
- N. aztecus (Mooser 1968). Widespread in Florida and also found in Texas, Oklahoma, and Chihuahua, became extinct ~11.2—5.7 Ma.
- N. beckensis (Dalquest and Donovan, 1973) found in Texas only and became extinct ~3.4 Ma.
- N. lenticularis (Cope, 1893). found in Alberta, Canada, North Carolina, Alabama, Nebraska, and Kansas becoming extinct ~13 Ma.
- N. montezumae (Leidy, 1882).
- N. morgani (Hulbert, 1993) restricted to Florida. Appears to become extinct ~8.6 Ma.
- N. peninsulatus (Cope, 1893) found in Florida, Texas, Oklahoma, New Mexico, Arizona, and Mexico becoming extinct ~3.3 Ma.
- N. parvulus (Marsh, 1868).
- N. westoni (Simpson, 1930) restricted to Florida. Became extinct ~9.1—8.7 Ma.
- ^ E. H. Sellards. 1916. Fossil vertebrates from Florida: A new Miocene fauna; new Pliocene species; the Pleistocene fauna. Florida State Geological Survey Annual Report 8:79-119
- ^ W. W. Dalquest and T. J. Donovan. 1973. A new three-toed horse (Nannippus) from the late Pliocene of Scurry County, Texas. Journal of Paleontology 47(1):34-45
- ^ R. C. Hulbert. 1993. Journal of Vertebrate Paleontology
- ^ G. G. Simpson. 1930. Bulletin of the American Museum of Natural History 59(3)