Eubranchus rustyus

Eubranchus rustyus, the homely aeolid, is a species of sea slug or nudibranch, a marine gastropod mollusc in the family Eubranchidae.

Distribution
This species was described from Monterey Bay, 36.60556°N, -121.88444°W, California. It is considered by most authors to be a synonym of Eubranchus occidentalis.

Biology
This nudibranch feeds on the hydroids Obelia and Plumularia.