_:b75689072 . . _:b76635813 . "Hexatrygonidae Heemstra & Smith, 1980" . _:b76635813 . . "Hexatrygonidae" . _:b75689072 . "521880" . "Hexatrygonidae" . . _:b76635813 "148836" . _:b76635813 . . _:b76635813 "WoRMS id" . "Hexatrygonidae" . _:b75689072 "5880" . . "5880" . . . . "148836" . _:b75689072 . . "Heemstra & Smith, 1980" . . _:b75689072 "GBIF id" .