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It is Armina sp. 9 in IPN at page 306:
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 can be easily recognized by its chocolate brown body color with longitudinal white lines on the notum. The oral veil has a few elongate tubercles and the rhinophores are brown basally with an orange club."
This species was posted on 5 April 2011 at these websites as Armina sp. E Genus: Rafinesque, 1814, on 18 July 2011 changed into
Armina sp. 05 Genus: Rafinesque, 1814.
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 27 February 2016, Armina sp. 05 Genus: Rafinesque, 1814
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Armina_sp_05.htm