Eubranchulus olivaceus is a species of sea slug or nudibranch, a marine gastropod mollusc in the family Eubranchidae.Bouchet, P.; Picton, B. (2025) Eubranchulus olivaceus (O'Donoghue, 1922). In: MolluscaBase (2026). Accessed through: World Register of Marine Species on 2026-04-18.
Distribution This species was described from Jesse Island and Brandon Island, Departure Bay, and the biological research station at Nanaimo, Vancouver Island, Canada. It is considered by some authors to be a synonym of the North Atlantic species Eubranchulus rupium.McDonald, G., (2015) Eubranchus rupium. Intertidal Invertebrates of the Monterey Bay Area, California.
Biology In the original description Eubranchulus olivaceus is reported to feed on Obelia longissima. It is also reported to feed on the hydroids Laomedea flexuosa, Obelia spp., & Plumularia sp.
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