White under a fine net of red-brown lines, with a mantle skirt that overhangs the body all the way round and a yellow and purple edge to it. Four centimeters (1.6 in), described from this sea in 1830.
That overhanging skirt is not just decoration. Members of this genus flap it - lifting and dropping the mantle margin in a slow, deliberate rhythm when they are disturbed, which displays the colored rim and, in some species, wafts the chemistry stored in it into the water. A slug that cannot run has to make being noticed work in its favor.
Underneath it is doing what chromodorids do: eating encrusting sponges, extracting their terpenoids intact, and storing them in glands around the mantle edge.
The genus name changed recently - these were all Chromodoris until the group was split - so photographs of this animal are filed under both names online, and older books use the other one.
- white body covered in a fine network of red-brown lines
- broad mantle skirt, wider than the foot, with a yellow and purple margin
- white gills and rhinophores tipped in red
- length up to 4 cm
