Phyllidia undulaPhyllidia undula is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.DescriptionThis species has previously been confused with Phyllidia ocellata.DistributionThis species was described from the Red Sea. It appears to be confined to the western Indian Ocean including the Red Sea, the African coast and the Island of Réunion.DietThis species feeds on a sponge.