A large, brilliantly coloured slug that grows up to 8 cm long. The body is white, suffused with pink in parts, varying to red in some individuals. There is a yellow band that runs around the edge of the foot. The head has two slender tentacles at the front, the body has a row of shorter tentacles on each side which extend to a circle of 21 gills at the back of the body. These are white at the base with orange or yellow tips.