Thuridilla coerulea is blue with red-orange and black markings. The oral tentacles are orange red with a black edging and the upper half of the rhinophores are black with a central black band. The parapodia are blue with a broad red-orange margin and an inner thin black line. (Rudman, 2010)
Comment from Terry Gosliner: It has the black tips that Thuridilla undula does not and does not have the deep undulations of Thuridilla undula. (Nudipixel)
- Rudman, W.B., 2010 (April 13) Thuridilla coerulea (Kelaart, 1858). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/thurcoer
- Eliot, C.N.E. (1906) On the nudibranchs of Southern India and Ceylon, with special reference to the drawings by Kelaart and the collections belonging to Alder & Hancock preserved in the Hancock Museum at Newcastle-on-Tyne. Proceedings of the Zoological Society of London, [for 1906] 2: 636-691. (Pls. 42-47). [Plate XLIII. Fig. 7 Elysia coerulea]
- Gosliner, T.M. (1995) The genus Thuridilla (Opisthobranchia: Elysiidae) from the tropical Indo-Pacific, with a revision of their phylogeny and systematics of the Elysiidae. Proceedings of the California Academy of Sciences, 49(1): 1-54.
- Kelaart, E.F. (1858). Description of new and little known species of Ceylon nudibranchiate molluscs and zoophytes. Journal of the Ceylon Branch of the Royal Asiatic Society, Colombo, 3(1): 84-139.with 2 plates
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