Risbecia nyalya is a species of colourful sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae. Distribution This nudibranch is found in the Caribbean. Description Risbecia nyalya has a blue or purple body with a white and orange-yellow lined mantle. The gills and rhinophores are purple or blue. The maximum recorded length is 35 mm. Habitat Minimum recorded depth is 2 m. Maximum recorded depth is 7 m. It feeds on sponges. References Further reading Ortea, J., Valdes, A. & Garcia-Gomez, J.C. (1996) Review of the Atlantic species of the Family Chromodorididae (Mollusca: Nudibranchia) of the blue chromatic group. Avicennia (Suppl. 1): 1-160. Rosenberg, G., F. Moretzsohn, and E. F. García. 2009. Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579–699 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Biodiversity. Texas A&M Press, College Station, Texas Chromodorididae Gastropods described in 1967