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it is Stiliger sp. 1 in IPN at page 74:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
Stiliger sp. 01 is characterised by having its eyes relatively close together, and by its transparent cerata with a dark/black digestive gland and subapical orange spots, the apex is blueish-white. The rhinophores are basal transparent then blueish-white. The maximal reported size is 8 mm.
It was posted on 17 December 2010 at these websites as Stiliger sp. A Genus: Ehrenberg, 1831,
on 15 August 2011 changed into Stiliger sp. 01 Genus: Ehrenberg, 1831.
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.
The sacoglossa expert Kathe R. Jensen still considers this species to be a Costasiella.(Pers. comment on 17 June 2018)
More information on Stiliger sp. 01 as Costasiella? sp. 2 are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2016), published 20 June 2016, Stiliger sp. 01 Genus: Ehrenberg, 1831
available from http://www.Philippine-Sea-Slugs.com/Sacoglossa/Stiliger_sp_01.htm