WAdelphotectonica reevei is a species of sea snail, a marine gastropod mollusk in the family Architectonicidae, known as the staircase shells or sundials.
WAnatoma munieri is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Anatomidae.
WBursa grayana is a species of sea snail, a marine gastropod mollusk in the family Bursidae, the frog shells.
WClanculus bathyraphe is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
WClanculus thomasi is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
WCompsodrillia tricatenaria is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
WCrimora papillata is a species of sea slug, a nudibranch, a shell-less marine gastropod mollusc in the family Polyceridae.
WDiaulula sandiegensis is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Discodorididae.
WDiodora variegata is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.
WDoris montereyensis is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Dorididae.
WDoto cuspidata is a species of sea slug, a dendronotid nudibranch, a marine gastropod mollusc in the family Dotidae.
WElimia pybasi is a species of freshwater snail with an operculum, aquatic gastropod mollusks in the family Pleuroceridae. This species is endemic to the United States.
WEthalia polita is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
WEurytrochus danieli is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
WGalba schirazensis is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Lymnaeidae, the pond snails.
WHomalopoma sangarense is a species of sea snail, a marine gastropod mollusk in the family Colloniidae.
WJulia exquisita is a species of very small sea snail with a shell comprising two separate hinged pieces or valves. It is a marine gastropod mollusk in the family Juliidae.
WMelanopsis etrusca is a species of freshwater snail in the family Melanopsidae. It is endemic to southern Italy, where it is found in hot springs. Today it is known from only four locations and its populations are decreasing. It is threatened by the draining of its hot spring habitat.
WNaggsia laomontana is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Plectopylidae.
WNucleolaria granulata, common name the granulated cowry, is a species of sea snail, a cowry, a marine gastropod mollusk in the family Cypraeidae, the cowries.
WOnchidoris loveni is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae. This species is found in the north-eastern parts of the Atlantic Ocean.
WPartulina proxima is a species of tropical air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Achatinellidae. This species is endemic to Moloka'i, Hawaii in the United States.
WPhasianella jaspidea is a species of sea snail, a marine gastropod mollusk in the family Phasianellidae.
WPhasianella nivosa is a species of sea snail, a marine gastropod mollusk in the family Phasianellidae.
WPowelliphanta hochstetteri, known as one of the amber snails, is a species of large, carnivorous land snail, a terrestrial pulmonate gastropod mollusc in the family Rhytididae.
WProcalpurnus semistriatus is a species of sea snail, a marine gastropod mollusk in the family Ovulidae, the ovulids, cowry allies or false cowries.
WRhodopetoma erosa is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.
WSagda alveare is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Sagdidae.
WSchizoglossa novoseelandica is a predatory species of air-breathing land slug or semi-slug, a terrestrial gastropod mollusc in the family Rhytididae. It is the type species of the genus Schizoglossa and is found only in New Zealand. The survival of this species is not threatened; it is not listed in the 2009 IUCN Red List nor is it in the 2005 New Zealand Threat Classification System lists.
WSediliopsis distans is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
WThylacodes natalensis, common name the solitary worm shell, is a species of sea snail, a marine gastropod mollusk, in the family Vermetidae, the worm snails or worm shells. The species was previously known as Serpulorbis natalensis.
WTibersyrnola cinnamomea is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.
WUmbonium thomasi is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
WXerocrassa frater is a species of air-breathing land snail, a pulmonate gastropod mollusk in the family Hygromiidae, the hairy snails and their allies. This species is endemic to the Balearic island of Mallorca in Spain.
WXerocrassa homeyeri is a species of air-breathing land snail, a pulmonate gastropod mollusk in the family Hygromiidae, the hairy snails and their allies. This species is endemic to the Balearic island of Mallorca in Spain.