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Phyllidiopsis sphingis  Brunckhorst, 1993

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Phyllidiopsis sphingis is characterized by white rhinophores, 3 low white ridges on the mantle with an iridescent blue broad margin and 4 black lines with black rays extending to the mantle edge. The 2 median black lines unite between the rhinophores.
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 informations on Phyllidiopsis sphingis are at Bill Rudman's Sea-Slug Forum!