It is a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae.

[3] Doriprismatica atromarginata ranges in color from creamy-white through yellow to pale brown.

It typically has a black-lined edge running down the outside of a very folded mantle and black rhinophore clubs.

The frilly mantle sometimes appears to move like a wave as the animal crawls along.

[3] The species is capable of obtaining metabolites from its food source, and uses them to protect itself against predators.