Eubranchulus rupium, the green balloon aeolid, is a species of sea slug or nudibranch, a marine gastropod mollusc in the family Eubranchidae.Bouchet, P.; Picton, B. (2026). Eubranchulus rupium (Møller, 1842). In: MolluscaBase (2026). Accessed through: World Register of Marine Species on 2026-04-18.
Distribution This species was described from Greenland. It is reported from the North Atlantic Ocean as far south as the Netherlands and is considered to be a circumpolar species. It is considered by most authors to be a synonym of Eubranchus olivaceus and is reported as far south as Monterey Bay, California on the Pacific Ocean coast of North America.McDonald, G., (2015) Eubranchus rupium. Intertidal Invertebrates of the Monterey Bay Area, California.Rudman, W.B., 2003 (July 14) Eubranchus rupium (Moller, 1842). [In] Sea Slug Forum. Australian Museum, Sydney.Goddard, J. H. R., & Nora R. Foster. 2002. Range extensions of sacoglossan and nudibranch mollusks (Gastropoda : Opisthobranchia) to Alaska. Veliger 45(4):331-336.
Biology This nudibranch feeds on the hydroids Laomedea longissima.
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