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Elysia sp. 18  Genus: Risso, 1818

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The sacoglossan Elysia sp. 18 is not yet identified or still undescribed, I call it Elysia sp. 18 to distinguish it from other species of Elysia, until I know its name.
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.
The specimens #3 and #4 were posted on 29 June 2017 at these websites as Elysia sp. 22  Genus: Risso, 1818,
I did not realize that this species was already as E. sp 18 online!
It is similar to Elysia sp. 6 in IPN at page 82, which lacks the pink magin of the parapodia.
Reference:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
How to cite:
Köhler, E. (2017), published 7 July 2017, Elysia sp. 18  Genus: Risso, 1818
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Elysia_sp_18.htm