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Very similar is Caloria indica. They can be distinguished by the line between the rhinophores: Caloria indica has a white line on an orange head, Phidiana militaris has an orange or red line on a white head.
More information on Phidiana militaris are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2018), published 29 January 2018, Phidiana militaris (Alder & Hancock, 1864)
available from https//www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Phidiana_militaris.htm