WList of prehistoric sponge genera
WChoia
WChoiaella
WCupulina
WCupulospongia
WDiagoniella
WEthmophyllum
WHalichondrites
WHazelia
WOtavia
WPalaeophragmodictya
WPeronidella
WPetaloptyon
WPlocoscyphia
WRaphidonema (sponge)
WSiphonia
WTakakkawia
WTuronia
WVauxia