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For a long time the name Stylocheilus longicauda was used for the more common species Stylocheilus striatus, Bill Rudman discusses the correct identity at the Sea-Slug Forum.
Pretty similar are
Petalifera ramosa which differs by the bownish or green body colour, firm conical tubercles with white basal ocelli and terminal papillae, and a short tail
Petalifera cf. ramosa which lacks the blue spots with orange ocelli and has a short 'tail'
More information on Stylocheilus longicauda are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2015), published 20 October 2015, Stylocheilus longicauda (Quoy & Gaimard, 1825)
available from https://www.Philippine-Sea-Slugs.com/Aplysiida/Stylocheilus_longicauda.htm