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This species of dorid nudibranch has a bluish body with yellow pustules arranged in ridges. There are black lines longitudinally, with radiating black lines that extend to the mantle edge. This slug might be mistaken for Phyllidia coelestis because both species have smaller pustules along the mantle edge with no yellow capping. However, P. coelestis has a wider mantle, and its dorsal pustules are not arranged in ridges.
Spotted this individual in around 22m of water at a dive site called Angel's Cove, Talikud Island, Samal, Philippines. It measured about 4cm long.