TetrabothriidaeTetrabothriidea is an order of helminths in the class Cestoda. It consists of only one family, Tetrabothriidae. Their hosts are mainly seabirds, the rest being cetaceans and pinnipeds.GeneraAll of the genera of Tetrabothriidea are in the family Tetrabothriidae.Anophryocephalus Baylis, 1922Chaetophallus Nybelin, 1916Priapocephalus Nybelin, 1922Strobilocephalus Baer, 1932Tetrabothrius Rudolphi, 1819Trigonocotyle Baer, 1932