Ocenebra erinacea africana – synonym of Ocenebra erinacea
Ocenebra erinacea algeriana – synonym of Ocenebra erinacea
Ocenebra erinacea elongata – synonym of Ocenebra erinacea
Ocenebra erinacea iberica – synonym of Ocenebra erinacea
Ocenebra erinacea neglecta – synonym of Ocenebra erinacea
Ocenebra erinacea pagodulina – synonym of Ocenebra erinacea
Ocenebra erinacea solidula – synonym of Ocenebra erinacea
Ocenebra erinacea var. carneola – synonym of Ocenebra erinacea
Ocenebra erinacea var. convulsa – synonym of Ocenebra erinacea
Ocenebra erinacea var. foliosa – synonym of Ocenebra erinacea
Ocenebra erinacea var. major – synonym of Ocenebra erinacea
Ocenebra erinacea var. mutica – synonym of Ocenebra erinacea
Ocenebra erinacea var. producta – synonym of Ocenebra erinacea
Ocenebra erinacea var. thersites – synonym of Ocenebra erinacea
Ocenebra erinacea var. venetiana – synonym of Ocenebra erinacea
Ocenebra erinacea var. viriditincta – synonym of Ocenebra erinacea
Ocenebra hanleyi var. benisafiensis – synonym of Ocenebra erinacea
Ocenebra hanleyi var. minor – synonym of Ocenebra erinacea
Octopus cirrhosa – synonym of Eledone cirrhosa
Octopus rugosa – synonym of Octopus vulgaris
Odontostomia perezi – synonym of Ondina diaphana
Odostomia acuta var. attenuata – synonym of Odostomia acuta
Odostomia acuta var. gracilis – synonym of Odostomia acuta
Odostomia alba – synonym of Odostomia scalaris
Odostomia albella – synonym of Odostomia carrozzai
Odostomia compactilis – synonym of Eulimella scillae
Odostomia conspicua alungata – synonym of Odostomia conspicua
Odostomia crassa – synonym of Odostomia eulimoides
Odostomia cylindrica – synonym of Chrysallida nivosa
Odostomia diaphana – synonym of Ondina diaphana
Odostomia dolioliformis – synonym of Noemiamea dolioliformis
Odostomia dubia – synonym of Odostomia eulimoides
Odostomia insculpta var. tumida – synonym of Ondina divisa
Odostomia interstincta: – synonym of Chrysallida interstincta
Odostomia jeffreysi var. flexicostata – synonym of Chrysallida interstincta
Odostomia laevissima – synonym of Ondina divisa
Odostomia litoris – synonym of Odostomia unidentata
Odostomia marionae – synonym of Onoba semicostata
Odostomia minima – synonym of Cima minima
Odostomia nagli – synonym of Odostomia conoidea
Odostomia nisoides – synonym of Eulimella scillae
Odostomia nitida – synonym of Odostomia scalaris
Odostomia nitidissima – synonym of Ebala nitidissima
Odostomia nivosa – synonym of Chrysallida nivosa
Odostomia notata – synonym of Odostomia eulimoides
Odostomia novegradensis – synonym of Odostomia eulimoides
Odostomia penchynati – synonym of Chrysallida interstincta
Odostomia plicata var. carinata – synonym of Odostomia plicata
Odostomia plicatula – synonym of Chrysallida pellucida
Odostomia rissoides – synonym of Odostomia scalaris
Odostomia rissoides var. exilis – synonym of Odostomia scalaris
Odostomia rissoiformis – synonym of Odostomia scalaris
Odostomia scalaris – synonym of Turbonilla jeffreysii
Odostomia scalaris var. rufescens – synonym of Turbonilla rufescens
Odostomia scillae var. compactilis – synonym of Eulimella acicula
Odostomia scotica – synonym of Odostomia conoidea
Odostomia spiralis – synonym of Chrysallida pellucida
Odostomia tenuis – synonym of Odostomia conoidea
Odostomia turrita var. nana – synonym of Odostomia turrita
Odostomia umbilicaris – synonym of Odostomia acuta
Odostomia umbilicaris var. elongata – synonym of Odostomia acuta
Odostomia umbilicata – synonym of Odostomia acuta
Odostomia unidentata sarsi – synonym of Odostomia unidentata
Odostomia unidentata var. elata – synonym of Odostomia unidentata
Odostomia ventricosa var. minima – synonym of Eulimella ventricosa
Odostomia vitrea – synonym of Odostomia plicata
Oenopota pyramidalis bretannica – synonym of Oenopota rufa
Okenia aspersa – synonym of Okenia quadricornis
Omalogyra atomus var. fasciata – synonym of Omalogyra atomus
Ommastrephes caroli – synonym of Ommastrephes bartramii
Onchidoris bilamellata – synonym of Onchidoris fusca
Onchidoris leachii – synonym of Onchidoris fusca
Onchidoris luteocincta: – synonym of Onchidoris luteocincta
Onoba aculeus – synonym of Onoba aculea
Onoba vitrea – synonym of Hyala vitrea
Oronthea montaguana – synonym of Kellia suborbicularis
Ortygia sulcata – synonym of Chamelea striatula
Ossiania alata – synonym of Philine punctata
Ossiania angulata – synonym of Philine angulata
Ossiania quadrata – synonym of Philine quadrata
Ostrea aculeata – synonym of Chlamys varia
Ostrea adriatica – synonym of Ostrea edulis
Ostrea arata – synonym of Chlamys sulcata
Ostrea cristata – synonym of Ostrea edulis
Ostrea cyrnusi – synonym of Ostrea edulis
Ostrea deformis – synonym of Ostrea edulis
Ostrea depressa – synonym of Ostrea edulis
Ostrea dubia – synonym of Aequipecten opercularis
Ostrea edulis var. crassa – synonym of Ostrea edulis
Ostrea edulis var. obtusa – synonym of Ostrea edulis
Ostrea edulis var. rutupina – synonym of Ostrea edulis
Ostrea edulis var. tarentina – synonym of Ostrea edulis
Ostrea edulis var. venetiana – synonym of Ostrea edulis
Ostrea elegans – synonym of Aequipecten opercularis
Ostrea flammea – synonym of Chlamys varia
Ostrea fucorum – synonym of Ostrea edulis
Ostrea gigas – synonym of Crassostrea gigas
Ostrea hians – synonym of Limaria hians
Ostrea hippopa – synonym of Ostrea edulis
Ostrea hybrida – synonym of Pseudamussium septemradiatum
Ostrea incarnata – synonym of Chlamys varia
Ostrea lamellosa – synonym of Ostrea edulis
Ostrea leonica – synonym of Ostrea edulis
Ostrea maxima – synonym of Pecten maximus
Ostrea miniata – synonym of Crassadoma pusio
Ostrea muricata – synonym of Chlamys varia
Ostrea mustellina – synonym of Chlamys varia
Ostrea ochroleuca – synonym of Chlamys varia
Ostrea opercularis – synonym of Aequipecten opercularis
Ostrea parasitica – synonym of Ostrea edulis
Ostrea peslutrae – synonym of Pseudamussium septemradiatum
Ostrea pusio – synonym of Crassadoma pusio
Ostrea rostrata – synonym of Ostrea edulis
Ostrea sinuosa – synonym of Crassadoma pusio
Ostrea sublamellosa – synonym of Ostrea edulis
Ostrea subrufa – synonym of Chlamys varia
Ostrea taurica – synonym of Ostrea edulis
Ostrea tumida – synonym of Hyalopecten similis
Ostrea varia – synonym of Chlamys varia
Ostrea versicolor – synonym of Chlamys varia
Ostrea virginica – synonym of Crassostrea virginica
Ostrea vulgaris – synonym of Ostrea edulis
Otina otis – synonym of Otina ovata
Ovatella polita – synonym of Odostomia conoidea
Ovula acuminata – synonym of Volvulella acuminata
Oxynoe glabra – synonym of Lamellaria perspicua