Trapania toddi  Rudman, 1987

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Trapania toddi is characterized by a white background colour with reticulate brown patches in which are small white spots. The extra-branchial and extra-rhinophoral processes are white, and have often yellow pigment.
Pretty similar is Trapania sp. B which has brown background colour with minute cream spots and reticulate white patches, and differs by its dark brown rhinophores with minute cream spots.
More information on Trapania toddi are on Bill Rudman's Sea-Slug Forum!