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Mexichromis cf. mariei is characterized by a pale pink background colour and a broad orange band at the mantle margin which is sometimes broken into a series of spots. It has a few very small white tipped tubercules. The rhinophores are purple, basal translucent. The gills are whitish translucent, edged in purple. The posterior end of the foot has a purple margin.
Pretty similar are
Mexichromis mariei which differs by its flattened rounded tubercles, which are tipped in reddish-purple,
Mexichromis multituberculata which can have also a series of orange patches at the edge of the mantle, usually these patches are bluish-purple. It differs by having numerous purple-tipped large tubercules.
More informations on Mexichromis mariei are at Bill Rudman's Sea-Slug Forum!