 Obtusella intersecta RISSOIDAE |
 Obtusella macilenta RISSOIDAE |
 Oceanida confluens EULIMIDAE |
 Ocenebra erinaceus MURICIDAE |
 Ocinebrina aciculata MURICIDAE |
 Ocinebrina buzzurioi MURICIDAE |
 Ocinebrina carmelae MURICIDAE |
 Ocinebrina coralinoides MURICIDAE |
 Ocinebrina edwardsii MURICIDAE |
 Ocinebrina erronea MURICIDAE |
 Ocinebrina helleri MURICIDAE |
 Ocinebrina hispidula MURICIDAE |
 Ocinebrina hybrida MURICIDAE |
 Ocinebrina ingloria MURICIDAE |
 Ocinebrina nicolai MURICIDAE |
 Ocinebrina paddeui MURICIDAE |
 Ocinebrina piantonii MURICIDAE |
 Ocinebrina reinai MURICIDAE |
 Octopus cyanea OCTOPODIDAE |
 Octopus defilippi OCTOPODIDAE |
 Octopus salutii OCTOPODIDAE |
 Octopus vulgaris OCTOPODIDAE |
 Odostomella bicincta PYRAMIDELLIDAE |
 Odostomella doliolum PYRAMIDELLIDAE |
 Odostomella jeffreysiana PYRAMIDELLIDAE |
 Odostomia aartseni PYRAMIDELLIDAE |
 Odostomia acuta PYRAMIDELLIDAE |
 Odostomia angusta PYRAMIDELLIDAE |
 Odostomia barashi PYRAMIDELLIDAE |
 Odostomia carrozzai PYRAMIDELLIDAE |
 Odostomia conoidea PYRAMIDELLIDAE |
 Odostomia conspicua PYRAMIDELLIDAE |
 Odostomia erjaveciana PYRAMIDELLIDAE |
 Odostomia eulimoides PYRAMIDELLIDAE |
 Odostomia fusulus PYRAMIDELLIDAE |
 Odostomia ignorata PYRAMIDELLIDAE |
 Odostomia imponderabilior PYRAMIDELLIDAE |
 Odostomia lorioli PYRAMIDELLIDAE |
 Odostomia lukisii PYRAMIDELLIDAE |
 Odostomia megerlei PYRAMIDELLIDAE |
 Odostomia nardoi PYRAMIDELLIDAE |
 Odostomia nitens PYRAMIDELLIDAE |
 Odostomia nofronii PYRAMIDELLIDAE |
 Odostomia plicata PYRAMIDELLIDAE |
 Odostomia rutor PYRAMIDELLIDAE |
 Odostomia scalaris PYRAMIDELLIDAE |
 Odostomia sicula PYRAMIDELLIDAE |
 Odostomia silesui PYRAMIDELLIDAE |
 Odostomia sorianoi PYRAMIDELLIDAE |
 Odostomia striolata PYRAMIDELLIDAE |
 Odostomia suboblonga PYRAMIDELLIDAE |
 Odostomia turriculata PYRAMIDELLIDAE |
 Odostomia turrita PYRAMIDELLIDAE |
 Odostomia unidentata PYRAMIDELLIDAE |
 Okenia elegans GONIODORIDIDAE |
 Okenia impexa GONIODORIDIDAE |
 Okenia leachii GONIODORIDIDAE |
 Okenia mediterranea GONIODORIDIDAE |
 Okenia quadricornis GONIODORIDIDAE |
 Omalogyra atomus OMALOGYRIDAE |
 Omalogyra simplex OMALOGYRIDAE |
 Onchidoris depressa ONCHIDORIDIDAE |
 Onchidoris neapolitana ONCHIDORIDIDAE |
 Onchidoris sparsa ONCHIDORIDIDAE |
 Onchodia valeriae CERITHIOPSIDAE |
 Ondina anceps PYRAMIDELLIDAE |
 Ondina crystallina PYRAMIDELLIDAE |
 Ondina dilucida PYRAMIDELLIDAE |
 Ondina divisa PYRAMIDELLIDAE |
 Ondina monterosatoi PYRAMIDELLIDAE |
 Ondina obliqua PYRAMIDELLIDAE |
 Ondina vitrea PYRAMIDELLIDAE |
 Ondina warreni PYRAMIDELLIDAE |
 Onoba aculeus RISSOIDAE |
 Onoba dimassai RISSOIDAE |
 Onoba gianninii RISSOIDAE |
 Onoba guzmani RISSOIDAE |
 Onoba josae RISSOIDAE |
 Onoba oliverioi RISSOIDAE |
 Onoba semicostata RISSOIDAE |
 Onoba tarifensis RISSOIDAE |
 Opalia abbotti EPITONIIDAE |
 Opalia crenata EPITONIIDAE |
 Opalia fusticulus EPITONIIDAE |
 Opalia hellenica EPITONIIDAE |
 Opaliopsis atlantis EPITONIIDAE |
 Orania fusulus MURICIDAE |
 Orbitestella dariae ORBITESTELLIDAE |
 Oscilla jocosa PYRAMIDELLIDAE |
 Osilinus articulatus TROCHIDAE |
 Osilinus lineatus TROCHIDAE |
 Osilinus turbinatus TROCHIDAE |
 Ostrea edulis OSTREIDAE |
 Ostreola stentina OSTREIDAE |
 Ovatella firmini ELLOBIIDAE |
 Oxygyrus keraudrenii ATLANTIDAE |
 Oxynoe olivacea OXYNOIDAE |
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