Phyllidiella granulata is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.
[2] This species was described from Guam with an additional specimen from Lizard Island, Australia.
It has been reported from the Philippines, Papua New Guinea and Sipadan Island.
There are two longitudinal black lines which run in a zigzag pattern between the tubercle groups, joining at the tail.
[3] This species has been reported to feed on the sponge Acanthella cavernosa.