WAmpullaria
WAmpullaria bicarinata
WArchinacelloidea
WBellerophontoidea
WCecilioides sommeri
WCochlostoma salomoni
WEcphora
WEuomphaloidea
WFedaiella
WFedaiellidae
WHarpagodidae
WHystrivasum squamosum
WLoxonematidae
WLoxonematoidea
WMacluritidae
WNerineoidea
WOmalaxidae
WPalmerella (gastropod)
WParafossarulus crassitesta
WPotamides (gastropod)
WPotamides archiaci
WProtatlanta rotundata
WScenelloidea
WSeguenzia monocingulata
WSuccinea antiqua
WTremanotidae
WTylostomatidae
WViviparus carinifer
WZygopleura
WZygopleuridae