Rostanga sp. 04  Genus: Bergh, 1879

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Rostanga sp. 04 is characterized by its pale pinkish mantle, and by the irregular reticulate pattern of thin white lines. The typical Rostanga rhinophores are translucent pinkish with white tips, the gills are translucent pinkish, edged in opaque white. This specimen seems to have some kind of hump at the right side behind the right rhinophore.
This specimen was identified by David W. Behrens as a version of IPN Rostanga sp. 1 at page 191:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Let me quote the description: "This species is unusual among species of Rostanga in having a white to pink body color."