WActinostoloidea
WPlagiorchiidaWPlagiorchiidaWPlagiorchiidaWPlagiorchiida
WBucephaloidea
WEchinostomata
WExocoetoidea
WFilarioidea
WFlustridae
WGasterocomaceaWPlagiorchiidaWPlagiorchiida
WHabronematoideaWPlagiorchiidaWPlagiorchiidaWPlagiorchiidaWPlagiorchiidaWPlagiorchiida
WLinguloidea
WMetridioideaWPlagiorchiidaWPlagiorchiida
WOmomyidaeWPlagiorchiidaWPlagiorchiida
WPlumularioideaWPlagiorchiida
WSchistosomatoidea
WTeleosauroidea
WThelazioidea
WTrichostrongyloidea
WTylenchoidea