Plakobranchus ocellatus

Plakobranchus ocellatus is our most common sap sucking sea slug. They can be encountered when snorkelling as well as scuba diving, as we have seen them only in shallow water on the reefs of Koh Phangan.
Between the parapodial flaps on their backs they culture green algal chloroplasts which provide an alternate energy source! More at Wikipedia.

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