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Chromodoris geometrica
Goniobranchus geometricus is a small nudibranch which may grow to a total length of 35mm. It is variably coloured, with the ground colour ranging from a creamy brown to purple, The mantle has numerous cream-coloured bumps and has a white margin. The gills and rhinophores are white to greenish.
This species is found throughout the Indian Ocean as well as the Western Pacific Ocean from the intertidal down to 30m.
Recently, taxonomic changes swept through the nudibranch world. This one is now known as Goniobranchus geometricus. I know, it can get confusing, especially that many of the online references are still using the old scientific names.