Sacoglossa
Sacoglossa are the sap-sucking sea slugs. Each tooth of their single-row radula pierces algal cells so that the slug can suck out the contents. Many, such as Elysia and Plakobranchus, keep the algae's chloroplasts working in their own tissues for weeks and are nicknamed "solar-powered" slugs. Most are small and well camouflaged on their food algae.
Two forms: elysiids have wing-like parapodia folded over a smooth back, while limapontioids (Cyerce, Costasiella, Stiliger) carry swollen, leaf-like or club-shaped cerata. Both have rolled or simple rhinophores and, typically, green tones from the algae they eat.
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