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Pretty similar are:
Phyllidiopsis annae which has black rhinophores and a granular blue mantle with a blue mantle margin and 4 black lines. The 2 median black lines unite between the rhinophores.
Phyllidiopsis phiphiensis which has black rhinophores, 2 low white ridges on the mantle with a white mantle margin with black spots and 3 black lines. This species was first reported from the Phi Phi Islands, Thailand and not yet from the Philippines.
Phyllidiopsis xishaensis which has translucent straw-coloured rhinophores, 3 low white ridges on the mantle with a white margin and 4 black lines. The 2 median black lines unite between the rhinophores. Sometimes there are also black spots at the white mantle margin.
More information on Phyllidiopsis sphingis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2018), published 25 January 2018, Phyllidiopsis sphingis Brunckhorst, 1993
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Phyllidiopsis_sphingis.htm