Halimeda Sap Sucking Slug - Elysia pusilla

''Elysia pusilla'' is a species of small sea slug, a marine gastropod mollusk in the family Plakobranchidae. It is a sacoglossan.

''Elysia pusilla'' feeds on the calcified green alga ''Halimeda'' and incorporates functioning chloroplasts into its body, thus it is known as a solar-powered sea slug. It is found in shallow water in tropical regions of the Indo-Pacific wherever its host species grows.