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It is most probably Cerberilla sp. 1 at Robert F. Bolland's OKINAWA SLUG SITE,
many pictures of it as Cerberilla sp. 1 are at umiushi-zukan.com.
It was posted on 7 May 2011 at these websites as Cerberilla sp. A Genus: Bergh, 1873, and changed on 27 July 2011 into
Cerberilla sp. 01 Genus: Bergh, 1873.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
How to cite:
Köhler, E. (2016), published 9 August 2016, Cerberilla sp. 01 Genus: Bergh, 1873
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Cerberilla_sp_01.htm