Equus africanus Equus asinus Equus hemionus Equus kiang †Equus hydruntinus Asinus is a subgenus of Equus that encompasses several subspecies of the Equidae commonly known as wild asses, characterized by long ears, a lean, straight-backed build, lack of a true withers, a coarse mane and tail, and a reputation for considerable toughness and endurance.

The common donkey is the best-known domesticated representative of the subgenus, with both domesticated and feral varieties.

Among the wild ass species, several never-domesticated species live in Asia and Africa, with the extinct European wild ass species formerly inhabiting Europe.

Cladogram based on whole nuclear genomes after Özkan et al.

[4]Equus africanus + Equus asinus African wild ass + domestic donkeys †Equus hydruntinus (European wild ass/hydruntine) †Equus hemionus hemippus (Syrian wild ass) Equus hemionus onager (Persian onager) Equus hemionus hemionus (Mongolian wild ass) + Equus (hemionus) kiang (kiang)