Acanthodoris pilosa

Acanthodoris pilosa, the hairy spiny doris, is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae. It is found in shallow water in the northeastern Atlantic Ocean, its range extending from Norway to France, and also both on the eastern coast of Canada and the United States, and the Pacific coast from the Aleutian Islands to Morro Bay, California.