WAlcadia
WAlcadia maxima
WBourdieria
WCraspedostomatidae
WEutrochatella tankervillii
WGeophorus
WGeophorus agglutinans
WGeorissa
WGeorissa filiasaulae
WGeorissa saulae
WHelicina aspersa
WHelicina fasciata
WHelicina platychila
WHelicina rostrata
WHelicinoidea
WNaticopsis
WNeritilia
WNeritilia manoeli
WNeritilia rubida
WNeritilia succinea
WNeritiliidae
WNeritoidea
WNeritopsis
WNeritopsis radula
WOgasawarana
WOgasawarana microtheca
WPalaeotrochidae
WPhenacolepadidae
WPlatyceratidae
WShinkailepas
WShinkailepas kaikatensis
WSiaesella
WSiaesella fragilis
WUstronia
WUstronia sloanei
WViana (gastropod)