Shell forming a straight or curved tube, open at one or both ends
Step 114
Shell more or less spiralled
Step 117
Shell cap-, hat- or disc-shaped, conical to oval
Step 311
219 possible taxa remaining show common names
- Aclis minor
- Aclis walleri
- Acmaea virginea
- Acteon tornatilis
- Akera bullata
- Alvania abyssicola
- Alvania beani
- Alvania cimicoides
- Alvania jeffreysi
- Alvania lactea
- Alvania punctura
- Alvania subsoluta
- Amauropsis islandica
- Ammonicera rota
- Anatoma crispata
- Ansates pellucida
- Aplysia punctata
- Aporrhais pespelecani
- Aporrhais serresianus
- Assiminea grayana
- Auriculinella erosa
- Barleeia unifasciata
- Bela brachystoma
- Bela nebula
- Beringius turtoni
- Berthella plumula
- Bittium reticulatum
- Buccinum humphreysianum
- Buccinum hydrophanum
- Buccinum undatum
- Cadulus subfusiformis
- Caecum clarkii
- Caecum glabrum
- Caecum trachea
- Calliostoma occidentale
- Calliostoma zizyphinum
- Calyptraea chinensis
- Capulus ungaricus
- Cerithiella metula
- Cerithiopsis tubercularis
- Charonia lampas
- Cheirodonta pallescens
- Chrysallida indistincta
- Chrysallida interstincta
- Chrysallida nivosa
- Chrysallida pellucida
- Chrysallida sarsi
- Cima minima
- Cingula trifasciata
- Circulus striatus
- Clelandella miliaris
- Colpodaspis pusillus
- Colus gracilis
- Colus islandicus
- Colus jeffreysianus
- Comarmondia gracilis
- Crepidula fornicata
- Crisilla semistriata
- Cylichna cylindracea
- Dentalium entalis
- Dentalium vulgare
- Diaphana minuta
- Dikoleps pusilla
- Diodora graeca
- Ebala nitidissima
- Emarginula crassa
- Emarginula fissura
- Emarginula rosea
- Epitonium clathratulum
- Epitonium clathrus
- Epitonium trevelyanum
- Epitonium turtonis
- Erato voluta
- Eulima bilineata
- Eulima glabra
- Eulimella acicula
- Eulimella scillae
- Eulimella ventricosa
- Euspira catena
- Euspira fusca
- Euspira montagui
- Euspira pallida
- Euspira pulchella
- Gibbula cineraria
- Gibbula magus
- Gibbula pennanti
- Gibbula tumida
- Gibbula umbilicalis
- Graphis albida
- Haliella stenostoma
- Haliotis tuberculata
- Hyala vitrea
- Hydrobia neglecta
- Hydrobia ulvae
- Iothia fulva
- Jujubinus exasperatus
- Jujubinus montagui
- Jujubinus striatus
- Lacuna crassior
- Lacuna pallidula
- Lacuna parva
- Lacuna vincta
- Lamellaria latens
- Lamellaria perspicua
- Lepeta caeca
- Liomesus ovum
- Littorina arcana
- Littorina fabalis
- Littorina littorea
- Littorina neglecta
- Littorina nigrolineata
- Littorina obtusata
- Littorina saxatilis
- Mangelia attenuata
- Mangelia coarctata
- Mangelia smithii
- Manzonia crassa
- Margarites groenlandicus
- Margarites helicinus
- Marshallora adversa
- Melanella alba
- Melanella lubrica
- Melanella monterosatoi
- Melaraphe neritoides
- Mercuria confusa
- Nassarius incrassatus
- Nassarius nitidus
- Nassarius pygmaeus
- Nassarius reticulatus
- Neptunea antiqua
- Neptunea contraria
- Noemiamea dolioliformis
- Nucella lapillus
- Obtusella intersecta
- Ocenebra erinacea
- Odostomia acuta
- Odostomia carrozzai
- Odostomia conoidea
- Odostomia conspicua
- Odostomia eulimoides
- Odostomia lukisii
- Odostomia plicata
- Odostomia scalaris
- Odostomia turrita
- Odostomia unidentata
- Oenopota rufa
- Oenopota trevelliana
- Oenopota turricula
- Omalogyra atomus
- Ondina diaphana
- Ondina divisa
- Onoba aculea
- Onoba semicostata
- Osilinus lineatus
- Otina ovata
- Ovatella denticulata
- Ovatella myosotis
- Patella intermedia
- Patella ulyssiponensis
- Patella vulgata
- Pelseneeria minor
- Philine angulata
- Philine aperta
- Philine catena
- Philine pruinosa
- Philine punctata
- Philine quadrata
- Philine scabra
- Pleurobranchus membranaceus
- Potamopyrgus antipodarum
- Propilidium exiguum
- Puncturella noachina
- Pusillina inconspicua
- Pusillina sarsii
- Raphitoma leufroyi
- Raphitoma linearis
- Raphitoma purpurea
- Retusa obtusa
- Retusa truncatula
- Retusa umbilicata
- Rissoa lilacina
- Rissoa membranacea
- Rissoa parva
- Rissoa porifera
- Rissoella diaphana
- Rissoella globularis
- Rissoella opalina
- Roxania utricula
- Scaphander lignarius
- Semisalsa stagnorum
- Simnia patula
- Skenea serpuloides
- Skeneopsis planorbis
- Tectura testudinalis
- Teretia teres
- Theodoxus fluviatilis
- Tornus subcarinatus
- Trichotropis borealis
- Tricolia picta
- Trivia arctica
- Trivia monacha
- Trophon barvicensis
- Trophon clathratus
- Trophon muricatus
- Trophon truncatus
- Troschelia berniciensis
- Turbonilla crenata
- Turbonilla jeffreysii
- Turbonilla lactea
- Turbonilla rufescens
- Turritella communis
- Typhlomangelia nivalis
- Urosalpinx cinerea
- Velutina plicatilis
- Velutina velutina
- Ventrosia ventrosa
- Vitreolina philippi
- Volutopsius norwegicus
- Volvulella acuminata
Decision path