Elysia ornata (Swainson, 1840) [Thallepus]

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Elysia ornata has usually a translucent green colour with a black parapodial margin and a submarginal yellowish-orange band. The tips of the rhinophores often have the same colour bands. There are also numerous black and white dots all over the body. Pretty similar is Elysia cf. ornata.
More information on Elysia ornata are on Bill Rudman's Sea-Slug Forum!