Mexichromis tica is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae.

Two specimens from Bajo del Diablo, Isla del Caño, (8°42′20″N 83°54′10″W / 8.705561°N 83.902846°W / 8.705561; -83.902846) on the adjacent mainland of Costa Rica were also included in the original description.

Mexichromis tica is translucent white with pink viscera showing through the back.

There is an opaque white band along the middle of the back and a broad opaque white band at the mantle edge.

There is a medial white band on the translucent foot with an elongate orange spot in it.