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Actinocyclus papillatus (Bergh, 1878) [Sphaerodoris]

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Actinocyclus papillatus is characterized many large rounded tubercles, the colour ranges from brown to cream-white, depending on the density of the cream white speckling scattered all over the brown mantle. It has a tough leathery mantle, with a circlet of many short gills held in a cup-shaped arrangement.
Let me quote Bill Rudman: "Until recently most specimens of Actinocyclus were identified as the single species Actinocyclus japonicus (Eliot, 1913) because of the difficulty in understanding earlier descriptions. Valdes (2002) reviewed the genus and has proposed we recognise two species, A. verrucosus and A. papillatus."
More informations on Actinocyclus papillatus are at Bill Rudman's Sea-Slug Forum!