Plocamopherus lemur is a species of sea slug, a nudibranch, a shell-less marine gastropod mollusk in the family Polyceridae.

White pigment is present in front of the branchial leaves, around the lateral appendages, at the base of the rhinophores and along the crest.

This white coloration is situated on the notum along a non-continuous line at the margin of both sides of the animal and joining behind the branchial leaves.

White pigment is also present along the margin of the sides of the body, the oral veil, tips of branchiae and clavus of the rhinophores.

The posterior portion of the foot forms a well-developed but short keel that is fringed on its upper margin.