Eubranchus occidentalis is a species of sea slug or nudibranch, a marine gastropod mollusc in the family Eubranchidae.Caballer, M. (2015). Eubranchus occidentalis MacFarland, 1966. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-12-31.
Distribution This species was described from Monterey Bay, California. It is considered by some authors to be a synonym of Eubranchus rustyus.McDonald, G., (2015) Eubranchus rustyus. Intertidal Invertebrates of the Monterey Bay Area, California.
Biology MacFarland reports that this nudibranch feeds on the hydroid Hydractinia, which grows on the holdfasts of Stephanocystis osmundacea.
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