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Okenia mediterranea
Mediterranean okenia

Omalosecosa ramulosa
Rameous bryozoan

Onchidella celtica
Celtic sea slug

Onoba semicostata
Semi-ribbed spire snail

Ophidiaster ophidianus
Purple starfish

Ophiocomina nigra
Black brittlestar

Ophioderma longicaudum
Smooth brittlestar

Ophiopsila aranea
Spider brittlestar

Ophiothrix fragilis
Common brittle star

Ophiura albida
Muddy brittlestar

Ophiura ophiura
Serpent brittlestar

Oscarella lobularis
Blue oscarella

Oscarella tuberculata
Yellow greenish oscarella

Oshurkovia littoralis
Coastal encrusting bryozoan

Osmundea pinnatifida
Pepper dulse

Ostrea edulis
European flat oyster

Oxydromus flexuosus
Blue-ringed worm

Pachycerianthus solitarius
Long-stalk tube anemone

Pachygrapsus marmoratus
Marbled rock crab

Pachymatisma johnstonia
Elephant's hide sponge

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