Genus
Elysia
Elysia hedgpethi. Photo: (c) Alex Bairstow, some rights reserved (CC BY-NC)
Elysia is a genus of sea slugs, marine gastropod molluscs in the family Plakobranchidae. These animals are colorful sea slugs, and they can superficially resemble nudibranchs, but are not very closely related to them. Instead they are sacoglossans, commonly known as sap-sucking slugs.
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