Mexichromis albofimbria is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[2] This nudibranch is known from New Caledonia.

[2] Mexichromis albofimbria has a pale-pink body, a thin white-lined mantle and pale orange gills and rhinophores.

It is almost identical to Thorunna punicea and very similar to members of the Hypselodoris bullocki group.

[2] This species can reach a total length of at least 11 mm,[2] and like all Chromodorids, feeds on sponges.