Mexichromis macropus is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae.[1]
This species is recorded from temperate and subtropical Australia including SW Western Australia, South Australia, Tasmania, Victoria, New South Wales and southern Queensland.[2]
Mexichromis macropus has a mantle border decorated with radially arranged orange or yellow-orange stripes rather than spots, as in Mexichromis katalexis or continuous lines as in Mexichromis mariei. The mantle ranges in colour from white to pink-purple and has scattered pointed papillae tipped in purple.[2]
This species feeds on a sponge in the genus Dysidea.[2]