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It is Otinodoris sp. 1 in IPN at at page 174:
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 met quote the desciption: " The large body with distinct concavities and small, compound papillae is distinctive. There is opaque white pigment covering the body. The large tubercles and concavities are lined with a black ring."
It was presented as the "Opisthobranch of the Week" on 08 March 2009 at Michael D. Miller's The Slug Site.
More pictures of Otinodoris sp. 01 and other species of Otinodoris are at NUDIPIXEL.
How to cite:
Köhler, E. (2016), published 15 November 2016, Otinodoris sp. 01 Genus: White, 1948
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Otinodoris_sp_01.htm