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Raja undulata
Undulate ray

Raphitoma purpurea
Purple raphitoma

Raspaciona aculeata
Red hispid sponge

Raspailia (Clathriodendron) hispida
Branched hispid sponge

Raspailia (Parasyringella) agnata
Antler sponge

Raspailia (Raspailia) ramosa
Chocolate finger sponge

Reptadeonella violacea
Purple encrusting bryozoan

Reteporella grimaldii
Neptunes' lace

Rhizostoma octopus
Barrel jellyfish

Rhizostoma pulmo
Mediterranean barrel jellyfish

Rhopalaea neapolitana
Bluish club-shaped ascidian

Rhyssoplax olivacea
Olive chiton

Rissoa parva
Tiny risso snail

Rostanga rubra
Red velvet sea slug

Ruditapes decussatus
Chequered carpet shell

Sabella discifera
Slender peacock worm

Sabella pavonina
Peacock worm

Sabella spallanzanii
Feather duster worm

Sabellaria alveolata
Honeycomb worm

Sacculina carcini
Green crab parasite

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