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Piran, Slovenia, Adriatic sea, Mediterranean sea, Sphaerechinus granularis, Sphaerechinus, Toxopneustidae, Purple Sea Urchin, Sea Urchin, Echinoidea, Echinodermata, Echinoderm, Reef, Corymorpha nutans, Corymorpha, Corymorphidae, Athecate hydroid, Hydroid, Hydrozoa, Cnidaria, Cnidarian