Mexichromis festiva is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Chromodorididae.Caballer, M. (2015). Mexichromis festiva (Angas, 1864). In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-11-17

Distribution This species was described from Port Jackson, Australia.Rudman W.B. (1983) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Chromodoris splendida, C. aspersa and Hypselodoris placida colour groups. Zoological Journal of the Linnean Society 78: 105-173. p. 155

Description Mexichromis festiva is a white chromodorid nudibranch with raised pink spots on the mantle. The edge of the mantle has a broken yellow line superimposed on an opaque white margin. The gill rachis is pink and the gill leaves are white. The outer half of the rhinophores is pink.Rudman, W.B., 1999 (January 16) Mexichromis festiva (Angas, 1864). [In] Sea Slug Forum. Australian Museum, Sydney.

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