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Trapania cf. euryeia is characterized by a brown background colour with reticulate white patches. The extra-branchial and extra-rhinophoral processes are white with some patches of the same colour as the body. The rhinophores and the base of the gills are also of the same colour as the body. It is often confused with the temperate Australian species Trapania brunnea Rudman, 1987.
Pretty similar are:
Trapania toddi which has a white background colour with reticulate brown patches in which are small white spots.
Trapania euryeia which has minute cream spots on the brown background.
At the Sea-Slug Forum are pictures by Bryan Mayes of a specimen from Anilao. Bill Rudman identified it as Trapania euryeia and wrote: "...it looks like this species is a bit variable in colour"
More information on Trapania euryeia are on Bill Rudman's Sea-Slug Forum!