Eubranchus agrius is a species of small sea slug or nudibranch, a marine gastropod mollusc in the family Eubranchidae.Caballer, M.; Rosenberg, G.; Bouchet, P. (2015). Eubranchus agrius Er. Marcus, 1959. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-12-26 It is an aeolid nudibranch, which is thought to occur in New Zealand and Chile.
Distribution This species was described from Chile. It has been reported from New Zealand.Miller, M. C. 1971. Aeolid nudibranchs (Gastropoda: Opisthobranchia) of the families Flabellinidae and Eubranchidae from New Zealand waters. Zoological Journal of the Linnean Society 50(4):311-337, pl. 1.
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