Eubranchus rustyus, the homely aeolid,[2] is a species of sea slug or nudibranch, a marine gastropod mollusc in the family Eubranchidae.

[3] This species was described from Monterey Bay, 36°36′20″N 121°53′04″W / 36.60556°N 121.88444°W / 36.60556; -121.88444, California.

It is considered by most authors to be a synonym of Eubranchus occidentalis.

[4] This nudibranch feeds on the hydroids Obelia and Plumularia.

[4][5]