Task: Sentence Expansion
Input (English): One species , the northern fur seal ( " Callorhinus ursinus " ) inhabits the North Pacific , while eight species in the " Arctocephalus " genus are found primarily in the Southern hemisphere .
Output (English): Eight species belong to the genus " Arctocephalus " and are found primarily in the Southern Hemisphere , while a ninth species also sometimes called fur seal , the northern fur seal ( " Callorhinus ursinus " ) , belongs to a different genus and inhabits the North Pacific .