Selection: Phyllodesmium opalescens

Phyllodesmium opalescens Rudman, 1991

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Phyllodesmium opalescens is characterised 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.
Pretty similar is Phyllodesmium cf. opalescens which is characterised by the missing of 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!