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

[2][3] This nudibranch is found in the tropical Western Pacific Ocean.

[4] Mexichromis similaris has a pale-lilac or violet body, with pale-orange gills and rhinophores.

This species is easily confused with other similarly coloured nudibranchs, especially Hypselodoris shimodaensis and Mexichromis trilineata.

[4][5][6][7] This nudibranch can reach a total length of at least 14 mm,[4] and like all Chromodorids, feeds on sponges.