Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Obtortionidae -  Obtortionidae is a family of sea snails marine gastropod molluscs in the superfamily 	Cerithioidea that is within the clade Cerithimorpha or in clade Sorbeoconcha.The shell of the larva is ornamental.
Animal