Click the thumbnail photos to enhance!
This species is Caloria sp. 4 in IPN on page 377
It was the Opisthobranch of the Week #626 on Michael D. Miller's The Slug Site.
Very similar is Caloria sp. 02 which lacks the opaque white median line on the head.
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 27 August 2016, Caloria sp. 01 Genus: Trinchese, 1888
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Caloria_sp_01.htm