WArturia darwinii
WCalcaronea
WCalcinea
WClathrina coriacea
WClathrina lacunosa
WClathrinida
WClathrinidae
WErnstia
WGrantiidae
WHeteropia glomerosa
WLeucaltidae
WLeucetta
WLeucettidae
WLeucosolenida
WLeucosoleniidae
WPeronidella
WRaphidonema (sponge)
WSycettidae
WSycon
WSycon ciliatum
WSycon elegans
WSycon raphanus