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This species was posted on 25 July 2017 at these websites as Eubranchus sp. 21 Genus: Forbes, 1838. Dr. Richard C. Willan identified it as a species of Tergipes Bergh, 1874. He writes (pers. comment):"Your Eubranchus sp. 21 is an undescribed species of Tergipes because it has only a single ceras in each cluster."
I changed it on 26 July 2017 into Tergipes sp. 03 Genus: Bergh, 1874
There are only a few pictures of this species online, 1 from Bali, Indonesia, and 1 from Komodo, Indonesia, and 2 from Ambon, Indonesia #1, #2.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch &Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
Köhler, E. (2017), published 27 July 2017, Tergipes sp. 03 Genus: Bergh, 1874
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Tergipes_sp_03.htm