Phyllodesmium magnumPhyllodesmium magnum is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.DistributionThis species was described from New Caledonia with additional material from NW Australia, the Marshall Islands and Hong Kong. The distribution of Phyllodesmium magnum includes North Kermadec and Guam.DescriptionThis species grows to 130 mm in length. It is one of the Phyllodesmium species which contain zooxanthellae.EcologyPhyllodesmium magnum feeds on a soft coral Sinularia sp.