Phyllidia polkadotsa  Brunckhorst, 1993

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Phyllidia polkadotsa is characterized by its distinctive colour pattern: the mantle is orange with black spots. Its rhinophores are yellow/orange. The notal tubercles are low and rounded and there are three low, median longitudinal ridges.
This shot shows a strange variant.
More information on Phyllidia polkadotsa are on Bill Rudman's Sea-Slug Forum!