This species accounts for 90% of the world cotton production. Among 50 species in the genus Gossypium, 45 are diploid (2n = 2x = 26) and 5 are allotetraploid (2n = 4x = 52).[79] [79] Sheep (Ovis orientalis aries) 54 Hyrax (Hyracoidea) 54 Hyraxes were considered to be the closest living relatives of elephants,[80] but sirenians have been found to be more closely related to elephants.