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Elysia sp. 18 is caracterized by its pale green colour with darker green longitudinal lines, and by an opaque pink margin of the parapodia. There is a thin dark green/brown submarginal line. On the head is a whitish-pink patch from the bases of the rhinophores to the parapodia. The rhinophores are basally whitish-pink then bright green, and the tips are pink.
It is very similar to Elysia sp. 6 in IPN at page 82, which lacks the pink magin of the parapodia.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.