Click the thumbnail photos to enhance!
Pretty similar are:
Trapania cf. euryeia which lacks the minute cream spots on the brown background.
Trapania toddi which has a white background colour with reticulate brown patches in which are small white spots, and differs by orange tips of the appendages, gills, and rhinophores. Pictures of this species from Hong Kong are here.
The specimen of the pictures #4 and #5 was misidentified and posted on 12 December 2010 at these websites as Trapania toddi Rudman, 1987,
I changed it on 3 August 2017 into Trapania euryeia Gosliner & Fahey, 2008.
More information on Trapania euryeia are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 3 August 2017, Trapania euryeia Gosliner & Fahey, 2008
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Trapania_euryeia.htm