 However, a 2018 DNA study suggested that modern Przewalski's horses may descend from the domesticated horses of the Botai culture.Przewalski's horse was described in 1881 by L. S. Poliakov, although the taxonomic position of Przewalski's horse remains controversial and no consensus exists whether it is a full species ("Equus przewalskii"), a subspecies of the wild horse ("Equus ferus przewalskii", along with the other subspecies, domesticated horse "E. f. caballus", and the extinct tarpan "E. f. ferus"), or even a subpopulation of the domestic horse.Early sequencing studies of DNA revealed several genetic characteristics of Przewalski's horse that differ from what is seen in modern domestic horses, indicating neither is ancestor of the other, and supporting the status of Przewalski horses as a remnant wild population not derived from domestic horses.