Alex Mustard / Details of ruffled mantle extensions on the Sacoglossan sea slug (Tridachia crispata) These also contain the chloroplasts of their algae food, that continue to photosynthesise inside the mollusc and p...

Doug Perrine / Lettuce backed nudibranch {Tridachia crispata}, Dominica, Caribbean

Pascal Kobeh / Lettuce seaslug (Elysia crispata). Bahamas.

Alex Mustard / Lettuce leaf sea slug (Elysia crispata) on a coral reef. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Shane Gross / Cose up of pattern detail on the back of a Lettuce Sea Slug (Elysia crispata) The Bahamas.