Distribution: Western Atlantic FromBermuda, Florida to southern Brazil. Natural History Notes: Feeds on species of Caulerpa. Characteristics: Yellow to green color with translucent spots, blue in some individuals. Body very elongate, with a long posterior end of food resembling a tail. Shell external, fragile, covered by parapodia in living animals. Parapodia covered by conical papillae. Rhinophores long. Color variable, generally greenish with brown, purple and black spots. "Tail" and rhinophores often covered by brownish bands. Bright blue spots are often present near edge of parapodia, Up to 20 mm long.