African wild ass descendant. Thus, if one species is recognized, the correct scientific name of the donkey is "E. africanus asinus". The first published name for the African wild ass, "Asinus africanus", Fitzinger, 1858, is a nomen nudum. The name "Equus taeniopus" von Heuglin, 1861 is rejected as indeterminable, as it is based on an animal that cannot be identified and may have been a hybrid between a domestic donkey and a Somali wild ass; the type has not been preserved. The first available name thus becomes "Asinus africanus" von Heuglin & Fitzinger, 1866. A lectotype is designated: a skull of an adult
Equus lambei of the modern wild horse, including the domestic horse, "Equus caballus". Controversy still surrounds "E. lambei" and the divergence of other similar extinct horse species. Through examinations of the bones and teeth of "Equus lambei", many similarities can be seen with the modern horse "Equus caballus". There is also a strong resemblance to "E. lambei" in the metapodials of "E. caballus przewalskii" and the phalanges of "E. caballus lenensis" "." Metrical and morphological studies of horse teeth from the Bluefish Caves confirm the close similarity between "Equus lambei" with wild and domestic horses alive today. "E. lambei" is a "caballus"