Triopha catalinae, commonly known as the sea clown triopha, is a species of colorful sea slug, a nudibranch, a shell-less marine gastropod mollusk in the family Polyceridae.

This colorful nudibranch (Triopha catalinae), which is a soft-bodied, marine gastropod mollusk, not to be confused with sea slugs, is one of more than 100 species that live on the rocky shores of ...