WCarychiinae
WEllobiidae
WAuriculastra
WAuriculastra duplicata
WAuriculinella
WCarychium
WCarychium exiguum
WCarychium mariae
WCarychium minimum
WCarychium pessimum
WCarychium tridentatum
WCassidula
WCassidula nucleus
WCassidula plecotrematoides
WEllobium
WEllobium aurisjudae
WEllobium aurismidae
WEllobium chinense
WEllobium pyramidale
WLaemodonta
WLaemodonta exaratoides
WLaemodonta monilifera
WLaemodonta siamensis
WLeucophytia bidentata
WMarinula
WMarinula filholi
WMelampus (gastropod)
WMelampus bidentatus
WMelampus coffea
WMelampus nuxeastaneus
WMelampus sincaporensis
WMicrotralia
WMyosotella
WMyosotella denticulata
WMyosotella myosotis
WOphicardelus
WOvatella
WPleuroloba
WPleuroloba costellaris
WPythia (gastropod)
WPythia cecillei
WPythia scarabaeus
WZospeum
WZospeum manitaense
WZospeum percostulatum
WZospeum tholussum