This is the blackest Elysia we have seen here in the Marshalls. The papillose rhinophores tie it somewhat to species like Elysia sp. 563 and it could be a color form of that species. This unique black one measured 5mm in length and was found on sand in 8m of water on the Kwajalein Atoll seaward reef on 2 April 2012.
Created 17 May 2012