Mexichromis antonii

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

Distribution
The holotype of this species was collected in 9 m of water at Punta Aguja (near Mulege), Baja California, Mexico (26.88333°N, -111.93333°W). Three paratypes were also included in the original description, from Isla San Jose, (24.88333°N, -110.56667°W), Los Islotes, (24.6°N, -110.4°W) and Santiago Bay, near Manzanillo, Colima, (19.1°N, -104.38333°W). It has been reported from the Gulf of California south to Panama.

Description
Mexichromis antonii has a light blue mantle with two bands of colour at the edge, inner black and outer yellow-orange. There is a mid-dorsal line of white which is broken into elongate spots surrounded by a pink-magenta region which stretches from the rhinophore bases to the gill. The light blue area is divided longitudinally by a faint black line. The bases of the rhinophores and gill leaves are pale magenta with the outer half black. Grows to 12 mm in length.