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This species is Janolus sp. 7 in IPN at page 319.
The body and the cerata are translucent, the latter with a purple subapical ring merging into bright blue, and a diffuse yellowish ring below the purple ring. The rhinophores are translucent orange with a purple tinge merging into dark purple towards the apices. The caruncle is pale yellowish/cream.There is a bluish margin to the foot, the 'tail' ist blue.
Pretty similar are:
Janolus sp. 01 which differs by the rhinophores: brown with white tips, and by the cerata: yellow subapical ring,
Janolus savinkini which differs by the rhinophores: yellowish with blue tips, and lacks the yellowish ring below the purple ring at the cerata,
Janolus sp. 03 which has opaque white specks on the cerata and rhinophores.
This picture was posted on 20 February 2011 at these websites as Janolus sp. B Genus: Bergh, 1884, which is now Janolus savinkini, because I thought it to be a colour variant. I realized on 22 March 2013 that it is distinct in IPN, I keep it also seperate until more research is done to clarify the variability of Janolus savinkini Martynov & Korshunova, 2012.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
How to cite:
Köhler, E. (2016), published 17 November 2016, Janolus sp. 05 Genus: Bergh, 1884
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Janolus_sp_05.htm