Fins extending along entire length of body on each side, but not joining posteriorly
Step 5
Fins forming rounded, projecting lateral lobes, not reaching the posterior part of the body
Step 7
Fins (sub)terminal, reaching the posterior part of the body
Step 12
21 possible taxa remaining show scientific names show common names
- Alloteuthis media
- Alloteuthis subulata
- Brachioteuthis riisei
- Galiteuthis armata
- Gonatus fabricii
- Illex coindetii
- Loligo forbesi
- Loligo vulgaris
- Ommastrephes bartramii
- Rossia macrosoma
- Rossia palpebrosa
- Sepia elegans
- Sepia officinalis
- Sepiella japonica
- Sepietta neglecta
- Sepietta oweniana
- Sepiola atlantica
- Sepiola aurantiaca
- Teuthowenia megalops
- Todarodes sagittatus
- Todaropsis eblanae
495 taxa excluded
show scientific names
show common names
- Abra alba
- Abra longicallus
- Abra nitida
- Abra prismatica
- Abra tenuis
- Acanthocardia echinata
- Acanthocardia tuberculata
- Acanthochitona crinita
- Acanthochitona fascicularis
- Acanthodoris pilosa
- Aclis minor
- Aclis walleri
- Acmaea virginea
- Acteon tornatilis
- Adalaria proxima
- Aegires punctilucens
- Aeolidia papillosa
- Aeolidiella glauca
- Aequipecten opercularis
- Akera bullata
- Alderia modesta
- Aldisa zetlandica
- Alvania abyssicola
- Alvania beani
- Alvania cimicoides
- Alvania jeffreysi
- Alvania lactea
- Alvania punctura
- Alvania subsoluta
- Amauropsis islandica
- Ammonicera rota
- Anatoma crispata
- Ancula gibbosa
- Anomia ephippium
- Ansates pellucida
- Aplysia punctata
- Aporrhais pespelecani
- Aporrhais serresianus
- Arca nodulosa
- Arca tetragona
- Archidoris pseudoargus
- Arcopagia balaustina
- Arcopagia crassa
- Arctica islandica
- Armina loveni
- Asperspina brambelli
- Assiminea grayana
- Astarte borealis
- Astarte elliptica
- Astarte montagui
- Astarte sulcata
- Atrina pectinata
- Auriculinella erosa
- Bankia fimbriatula
- Barleeia unifasciata
- Barnea candida
- Barnea parva
- Bathyarca pectunculoides
- Bela brachystoma
- Bela nebula
- Beringius turtoni
- Berthella plumula
- Bittium reticulatum
- Buccinum humphreysianum
- Buccinum hydrophanum
- Buccinum undatum
- Cadlina laevis
- Cadulus subfusiformis
- Caecum clarkii
- Caecum glabrum
- Caecum trachea
- Calliopaea bellula
- Calliostoma occidentale
- Calliostoma zizyphinum
- Callochiton septemvalvis
- Calyptraea chinensis
- Capulus ungaricus
- Cardiomya costellata
- Cerastoderma edule
- Cerastoderma lamarcki
- Cerithiella metula
- Cerithiopsis tubercularis
- Chaetoderma nitidulum
- Chamelea striatula
- Charonia lampas
- Cheirodonta pallescens
- Chlamys sulcata
- Chlamys varia
- Chrysallida indistincta
- Chrysallida interstincta
- Chrysallida nivosa
- Chrysallida pellucida
- Chrysallida sarsi
- Cima minima
- Cingula trifasciata
- Circulus striatus
- Clausinella fasciata
- Clelandella miliaris
- Cochlodesma praetenue
- Colpodaspis pusillus
- Colus gracilis
- Colus islandicus
- Colus jeffreysianus
- Comarmondia gracilis
- Corambe obscura
- Corbula gibba
- Coryphella browni
- Coryphella gracilis
- Coryphella lineata
- Coryphella pedata
- Coryphella pellucida
- Coryphella verrucosa
- Crassadoma pusio
- Crassostrea gigas
- Crassostrea virginica
- Crenella decussata
- Crepidula fornicata
- Crisilla semistriata
- Cuspidaria cuspidata
- Cuspidaria obesa
- Cuspidaria rostrata
- Cuthona amoena
- Cuthona caerulea
- Cuthona concinna
- Cuthona foliata
- Cuthona gymnota
- Cuthona nana
- Cuthona pustulata
- Cuthona rubescens
- Cuthona viridis
- Cylichna cylindracea
- Dendronotus frondosus
- Dentalium entalis
- Dentalium vulgare
- Devonia perrieri
- Diaphana minuta
- Dikoleps pusilla
- Diodora graeca
- Diplodonta rotundata
- Donax vittatus
- Dosinia exoleta
- Dosinia lupina
- Doto coronata
- Doto cuspidata
- Doto dunnei
- Doto fragilis
- Doto millbayana
- Doto pinnatifida
- Doto tuberculata
- Ebala nitidissima
- Eledone cirrhosa
- Elysia viridis
- Emarginula crassa
- Emarginula fissura
- Emarginula rosea
- Embletonia pulchra
- Ensis americanus
- Ensis arcuatus
- Ensis ensis
- Ensis minor
- Ensis siliqua
- Epilepton clarkiae
- Epitonium clathratulum
- Epitonium clathrus
- Epitonium trevelyanum
- Epitonium turtonis
- Erato voluta
- Eubranchus cingulatus
- Eubranchus doriae
- Eubranchus exiguus
- Eubranchus farrani
- Eubranchus pallidus
- Eubranchus tricolor
- Eubranchus vittatus
- Eulima bilineata
- Eulima glabra
- Eulimella acicula
- Eulimella scillae
- Eulimella ventricosa
- Euspira catena
- Euspira fusca
- Euspira montagui
- Euspira pallida
- Euspira pulchella
- Facelina bostoniensis
- Facelina coronata
- Falcidens crossotus
- Favorinus blianus
- Favorinus branchialis
- Gari costulata
- Gari depressa
- Gari fervensis
- Gari tellinella
- Geitodoris planata
- Gibbula cineraria
- Gibbula magus
- Gibbula pennanti
- Gibbula tumida
- Gibbula umbilicalis
- Glycymeris glycymeris
- Goniodoris castanea
- Goniodoris nodosa
- Goodallia triangularis
- Gouldia minima
- Graphis albida
- Haliella stenostoma
- Haliotis tuberculata
- Hanleya hanleyi
- Hemilepton nitidum
- Hermaea bifida
- Hero formosa
- Heteranomia squamula
- Hiatella arctica
- Hyala vitrea
- Hyalopecten similis
- Hydrobia neglecta
- Hydrobia ulvae
- Idas simpsoni
- Iothia fulva
- Irus irus
- Ischnochiton albus
- Janolus cristatus
- Janolus hyalinus
- Jorunna tomentosa
- Jujubinus exasperatus
- Jujubinus montagui
- Jujubinus striatus
- Kellia suborbicularis
- Lacuna crassior
- Lacuna pallidula
- Lacuna parva
- Lacuna vincta
- Laevicardium crassum
- Lamellaria latens
- Lamellaria perspicua
- Lasaea rubra
- Lepeta caeca
- Lepidochitona cinerea
- Leptochiton asellus
- Leptochiton cancellatus
- Lepton squamosum
- Limacia clavigera
- Limapontia capitata
- Limapontia depressa
- Limapontia senestra
- Limaria hians
- Limatula gwyni
- Limatula subauriculata
- Limea loscombi
- Liomesus ovum
- Littorina arcana
- Littorina fabalis
- Littorina littorea
- Littorina neglecta
- Littorina nigrolineata
- Littorina obtusata
- Littorina saxatilis
- Lomanotus genei
- Lomanotus marmoratus
- Loripes lacteus
- Lucinella divaricata
- Lucinoma borealis
- Lutraria angustior
- Lutraria lutraria
- Lyonsia norwegica
- Macoma balthica
- Macoma calcarea
- Mactra stultorum
- Mangelia attenuata
- Mangelia coarctata
- Mangelia smithii
- Manzonia crassa
- Margarites groenlandicus
- Margarites helicinus
- Marshallora adversa
- Melanella alba
- Melanella lubrica
- Melanella monterosatoi
- Melaraphe neritoides
- Mercenaria mercenaria
- Mercuria confusa
- Microhedyle lactea
- Modiolarca subpicta
- Modiolula phaseolina
- Modiolus barbatus
- Modiolus modiolus
- Montacuta substriata
- Montacuta tenella
- Musculus costulatus
- Musculus discors
- Musculus niger
- Mya arenaria
- Mya truncata
- Myrtea spinifera
- Mysella bidentata
- Mysella dawsoni
- Mysella tumidula
- Mysia undata
- Mytilus edulis
- Mytilus galloprovincialis
- Nassarius incrassatus
- Nassarius nitidus
- Nassarius pygmaeus
- Nassarius reticulatus
- Nematomenia banyulensis
- Neomenia carinata
- Neptunea antiqua
- Neptunea contraria
- Noemiamea dolioliformis
- Nototeredo norvegica
- Nucella lapillus
- Nucula hanleyi
- Nucula nitidosa
- Nucula nucleus
- Nucula sulcata
- Nuculana minuta
- Nuculana pernula
- Nuculoma tenuis
- Obtusella intersecta
- Ocenebra erinacea
- Octopus vulgaris
- 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
- Okenia leachii
- Okenia quadricornis
- Omalogyra atomus
- Onchidoris depressa
- Onchidoris fusca
- Onchidoris inconspicua
- Onchidoris luteocincta
- Onchidoris muricata
- Onchidoris pusilla
- Onchidoris sparsa
- Ondina diaphana
- Ondina divisa
- Onoba aculea
- Onoba semicostata
- Osilinus lineatus
- Ostrea edulis
- Otina ovata
- Ovatella denticulata
- Ovatella myosotis
- Palliolum furtivum
- Palliolum striatum
- Palliolum tigerinum
- Pandora albida
- Pandora pinna
- Panomya arctica
- Paphia aurea
- Paphia rhomboides
- Parvicardium exiguum
- Parvicardium minimum
- Parvicardium ovale
- Parvicardium scabrum
- Patella intermedia
- Patella ulyssiponensis
- Patella vulgata
- Pecten maximus
- Pelseneeria minor
- Petricola pholadiformis
- Pharus legumen
- Phaseolus guilonardi
- Phaxas pellucidus
- Philine angulata
- Philine aperta
- Philine catena
- Philine pruinosa
- Philine punctata
- Philine quadrata
- Philine scabra
- Philinoglossa helgolandica
- Pholas dactylus
- Placida dendritica
- Pleurobranchus membranaceus
- Pododesmus patelliformis
- Pododesmus squama
- Polycera dubia
- Polycera faeroensis
- Polycera notha
- Polycera quadrilineata
- Potamopyrgus antipodarum
- Propilidium exiguum
- Pseudamussium septemradiatum
- Psiloteredo megotara
- Puncturella noachina
- Pusillina inconspicua
- Pusillina sarsii
- Raphitoma leufroyi
- Raphitoma linearis
- Raphitoma purpurea
- Retusa obtusa
- Retusa truncatula
- Retusa umbilicata
- Rhopalomenia aglaopheniae
- Rissoa lilacina
- Rissoa membranacea
- Rissoa parva
- Rissoa porifera
- Rissoella diaphana
- Rissoella globularis
- Rissoella opalina
- Rostanga rubra
- Roxania utricula
- Runcina coronata
- Saxicavella jeffreysi
- Scaphander lignarius
- Scrobicularia plana
- Scutopus ventrolineatus
- Semisalsa stagnorum
- Simnia patula
- Skenea serpuloides
- Skeneopsis planorbis
- Solecurtus chamasolen
- Solecurtus scopula
- Solen marginatus
- Sphenia binghami
- Spisula elliptica
- Spisula solida
- Spisula subtruncata
- Striarca lactea
- Tapes decussata
- Tapes philippinarum
- Tectura testudinalis
- Tellimya ferruginosa
- Tellina donacina
- Tellina fabula
- Tellina pygmaea
- Tellina tenuis
- Tenellia adspersa
- Teredo navalis
- Teredora malleolus
- Teretia teres
- Tergipes tergipes
- Thecacera pennigera
- Theodoxus fluviatilis
- Thracia convexa
- Thracia distorta
- Thracia papyracea
- Thracia villosiuscula
- Thyasira croulinensis
- Thyasira equalis
- Thyasira ferruginea
- Thyasira flexuosa
- Thyasira gouldi
- Thyasira sarsi
- Timoclea ovata
- Tonicella marmoreus
- Tonicella rubra
- Tornus subcarinatus
- Trichotropis borealis
- Tricolia picta
- Tritonia hombergi
- Tritonia lineata
- Tritonia plebeia
- Trivia arctica
- Trivia monacha
- Trophon barvicensis
- Trophon clathratus
- Trophon muricatus
- Trophon truncatus
- Troschelia berniciensis
- Turbonilla crenata
- Turbonilla jeffreysii
- Turbonilla lactea
- Turbonilla rufescens
- Turritella communis
- Turtonia minuta
- Typhlomangelia nivalis
- Urosalpinx cinerea
- Velutina plicatilis
- Velutina velutina
- Venerupis saxatilis
- Venerupis senegalensis
- Ventrosia ventrosa
- Venus casina
- Venus verrucosa
- Vitreolina philippi
- Volutopsius norwegicus
- Volvulella acuminata
- Xylophaga dorsalis
- Xylophaga praestans
- Yoldiella lucida
- Yoldiella philippiana
- Zirfaea crispata
Decision path