Kleptoplasty occurs when an organism that is a predator of another photosynthetic organism does not digest its chloroplasts but recovers them for its own use.
The stolen plastids are called kleptoplasts, literally " stolen plastid "
This phenomenon has surely played an important role in the acquisition of photosynthesis by numerous taxons over the course of evolution.
The sea slug Elysia chlorotica looks like a dark green leaf. This comes from the fact that it recycles the chloroplasts of its prey (Vaucheria litorea) in its digestive tube. © Mary S. Tyler / PNAS