Phyllodesmium opalescensPhyllodesmium opalescens is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.DistributionThe type locality of Phyllodesmium opalescens is Mirs Bay, Hong Kong. It has been reported from Korea and the Philippines.DescriptionThis species grows to 20 mm in length. It does not sequester zooxanthellae.EcologyThe food of Phyllodesmium opalescens is unknown.