Hermissenda emurai is a species of brightly coloured sea slug or nudibranch, a marine gastropod mollusc in the family Myrrhinidae.Lindsay, T. & Valdés, Á. (2016) The Model Organism Hermissenda crassicornis (Gastropoda: Heterobranchia) Is a Species Complex. PLoS ONE 11(4): e0154265.MolluscaBase eds. (2026). MolluscaBase. Accessed through: World Register of Marine Species at: Hermissenda emurai (Baba, 1937)Accessed on 2026-03-31
Distribution This nudibranch was described from Niigata, Niigata Prefecture, Sea of Japan, Japan. Its distribution includes KoreaD.B.Koh, 2006 (Feb 24) Hermissenda crassicornis from Sth Korea. [Message in] Sea Slug Forum. Australian Museum, Sydney. and the Russian coast of the Japan Sea (although, no facts confirming distribution in Russia provided). It was (incorrectly) synonymised with Hermissenda crassicornis in 1983.McDonald G. R. (1983) A review of the nudibranchs of the California coast. Malacologia 24: 114–276.
Description The species grows to be about 50 mm, or about 2 inches.
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