Tambja affinis is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Polyceridae.MolluscaBase (2018). Tambja affinis (Eliot, 1904). Accessed through: World Register of Marine Species on 2018-08-20.

Distribution This species was originally described from a specimen found at Zanzibar, East Africa.Eliot, C. (1904) On some Nudibranchs from East Africa and Zanzibar. Part IV. Proceedings of the Zoological Society of London, 74: 380–406 It has been reported from various sites in the Indian Ocean, as far east as Ningaloo Reef, western AustraliaRudman, W.B., 2005 (August 15) Tambja affinis (Eliot, 1904). [In] Sea Slug Forum. Australian Museum, Sydney.

Description Tambja affinis has bright yellow stripes on a blue background.Pola M., Cervera J.L. & Gosliner T.M. (2006) Taxonomic revision and phylogenetic analysis of the genus Tambja Burn, 1962 (Mollusca, Nudibranchia, Polyceridae). Zoologica Scripta 35(5):491-530.

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