Selection: Phyllodesmium opalescens

Phyllodesmium opalescens Rudman, 1991

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Phyllodesmium opalescens is characterized by a series of white marks down the midline. The cerata, rhinophores and oral tentacles are all capped with white or cream yellow, followed by a bluish region near the end. The orange digestive gland duct in the cerata is unbranched.
Pretty similar is Phyllodesmium cf. opalescens which lacks the series of white marks down the midline.
Many other members of the genus Phyllodesmium are what Bill Rudman calls "Solar-powered Sea Slugs", Phyllodesmium opalescens is not one of them.
More informations on Phyllodesmium opalescens are at Bill Rudman's Sea-Slug Forum!