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)
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