Elysia marginata; Plakobranchidae

Elysia marginata was spotted when we were diving in Chaloklum Bay, Koh Phangan. This must be the best local dive site for opisthobranchs. It was not easy to photograph as the surge was wafting its parapodial flaps to and fro all the time.
Note that this Sacoglossan might actually be Elysia ornata, but we’re keeping it this way for now…