Nihonbranchus horii is a species of sea slug or nudibranch, a marine gastropod mollusc in the family Eubranchidae.Gofas, S.; Caballer, M. (2015). Nihonbranchus horii Baba, 1960. In: MolluscaBase (2026). Accessed through: World Register of Marine Species on 2026-04-17
Distribution This species was described from Hayama, Sagami Bay, Japan. Additional specimens included in the original description were from Tannowa, Osaka Bay; from among a hydroid colony on Ecklonia leaves at Mukaishima, Seto Inland Sea and from Abugashima, Toyama Bay. It has been photographed at Kurosaki, Toyama Bay.Anon. (2015) Eubranchus horii. Sea Slug from the Japan Sea Coasts of Middle Japan.
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