, Wadaella , Wahlia , Wardianum , Wardium , Wardius , Wardula , Waretrematidae , Weissius , Weketrema , Whitegonimus , Winkenhughesia , Winkenthughesia
, Wadaella , Wahlia , Wardianum , Wardium , Wardius , Wardula , Waretrematidae , Weissius , Weketrema , Whitegonimus , Winkenhughesia , Winkenthughesia