Mouflon the "Systema Naturæ", Linnaeus and Gmelin treated the mouflon and argali as one species. Von Schreiber used the combination "Ovis aries musimon" as early as 1782. In 1792, Robert Kerr listed the "Corsican argali" as a separate variety of argali ("Ovis Ammon europaea"), writing I have introduced this variety on the authority of Mr Pennant, who distinguishes between the Argali of Corsica and the Siberian, though the difference seems chiefly in colour ; one specimen brought from that island by the famous Paoli, differed from the above in colour, having a large white spot on the front of the neck,
Wild horse cranial and metacarpal differences, indicates the presence of only two subspecies in postglacial times, the tarpan and Przewalski's horse. At present, the domesticated and wild horses are considered a single species, with the valid scientific name for the horse species being "Equus ferus." The wild tarpan subspecies is "E. f. ferus", Przewalski's horse is "E. f. przewalskii", and the domesticated horse is "E. f. caballus". The rules for the scientific naming of animal species are determined in the International Code of Zoological Nomenclature, which stipulates that the oldest available valid scientific name is used to name the species. Previously, when