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.