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This species is Janolus sp. 1 in IPN at page 317:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
The cerata and the rhinophores are pale yellowish/cream with a bright blue tip and a purple subapical band, and opaque white specks and warts. The caruncle is opaque white.
Pretty similar are:
Janolus sp. 01 which differs by the rhinophores: brown with white tips, and the cerata: yellow subapical ring
Janolus savinkini which has no opaque white spots on the cerata and rhinophores
Janolus sp. 05 which differs by the rhinophores: blueish tinge with darker apices, and by the cerata: translucent with a diffuse yellowish ring below the purple ring, and lacks the opaque white spots on the cerata and rhinophores.
It was originally posted at these websites as Janolus sp. C Genus: Bergh, 1884.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I have 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 6 January 2016, Janolus sp. 03 Genus: Bergh, 1884
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Janolus_sp_03.htm