Oxynoe sp. 01  Genus: Rafinesque, 1814

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Oxynoe sp. 01 has a fragile bubble-shaped shell which is partially enclosed by parapodial flaps. It is characterized by its large papillae and by the brown reticulate pattern upon tan parts of body, rhinophores, and parapodia. It is pale greenish yellow, with large bright blue spots. It is reported to feed on Caulerpa filicoides and Caulerpa fastigiata algae.
It is Oxynoe sp. 1 in IPN at page 67:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Originally posted at these websites as Oxynoe sp. A  Genus: Rafinesque, 1814.
For some genera, such as Trinchesia is the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I have chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
More information on Oxynoe sp. 01 as Oxynoe sp. 4 are on Bill Rudman's Sea-Slug Forum!