Examples of photosynthetic sacoglossans with varied times of chloroplast retention. (A) Elysia chlorotica [reprinted with permission (Rumpho et al., 2008)], (B) Elysia crispata, (C) Plakobranchus ocellatus, (D) Costasiella ocellifera, (E) Thuridilla gracilis, (F) Costasiella kurishimae, (G) Alderia modesta, (H) Lobiger viridis and (I) Oxynoe antillarum. Photos in panels B, D, E, G and I were provided with permission by Patrick Krug; photos in panels C, F and H were provided with permission by Heike Wägele.