Pseudunela cornuta is a species of minute sea slug, an acochlidian, a shell-less marine and temporarily brackish gastropod mollusk in the family Pseudunelidae. Adults are about 3 mm long and live in the spaces between sand grains. A complex interactive 3D reconstruction (a 3D visualization based on 420 paraffin histological sections) of the body of an individual of this species has been available since 2009.