Flabellinopsis iodinea, the Spanish shawl, is a species of aeolid nudibranch, a very colorful sea slug.

It has been reported as far north as British Columbia, Canada, and as far south as Punta Asunción, Baja California Sur, Mexico.

This nudibranch displays a stunning set of colors: the body is purple, the cerata are orange and the rhinophores are scarlet.

The neon orange appendages on the back of Flabellinopsis iodinea are the cerata which extract oxygen from the sea water they are surrounded by and live in.

The cerata are also extensions of the digestive system, and are used to store the stinging cells of the anemones and fan-like hydroids they eat.