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Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp. page 107:
"Translucent white, heavily speckled all over the body with small orange dots. Three pairs of short lateral appendages, the two posterior pairs have a prominent, brown globular structure. Three gill branches, which have a distinctive opqaque white line along the rachis."
Bill Rudman writes in a comment at the Sea-Slug Forum:
"Unfortunately, Vallès & Gosliner do not include P. ceylonicus in their review of the genus so I can't comment on their reasons for proposing the new species P. maculapodium. Two other new species in their paper, P. lemur and P. pecoso would also appear to be colour forms of this orange spotted 'species'..."
That is Plocamopherus pecoso is possibly a synonym of Plocamopherus ceylonicus, I will keep it until this species is formally synonymized.
Reference: Valles, Y. & T.M. Gosliner. 2006. Shedding light onto the genera Kaloplocamus and Plocamopherus (Mollusca: Nudibranchia) with description of new species belonging to these unique bioluminescent dorids. The Veliger, 48: 178-205.