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Green Elysia (Green Sea Slug)

HomeMarine InvertebratesGreen Elysia (Green Sea Slug)

Green Elysia (Green Sea Slug)

Elysia viridis

This small sea slug can incorporate chloroplasts from the algae it consumes, letting it photosynthesise to some degree—an unusual trait in the animal kingdom. Its flattened body and vivid colour make it stand out against darker seaweed. Around Lihou, search carefully in rockpools where green algae grow; if you spot a tiny splash of bright green, it could be the Green Elysia.

  • Habitat: Shallow rocky or weedy areas in the lower intertidal and subtidal, often on green seaweeds.
  • When to See: Mostly spring through autumn.
  • Length: 1–3 cm