Lichens and corals have a bit in common. They are both cases of symbiosis between a non-photosynthetic lifeform and a photsynthetic lifeform. In the case of coral, the NPL is an animal: in the case of lichens, a fungus.
Kleptoplasty is a bit different: the photosynthetic lifeform is consumed or otherwise destroyed, and the consumer then hosts their photosynthetic organelles “plastids”, which can live on for months, providing the beastie with chemical energy.
https://www.sciencedirect.com/science/article/pii/S096098222300324X
What is kleptoplasty? It’s when heterotrophs steal chloroplasts from algae and incorporate them into their cytosol. This is quite fascinating since heterotrophs do not usually have chloroplasts. Some heterotrophs go even further — their stolen chloroplasts (kleptoplasts) stay photosynthetic for weeks to months. This phenomenon is called functional kleptoplasty (or plastid symbiosis), and the heterotrophs are then sometimes referred to as photosynthetic. Functional kleptoplasty is a unique example of photosymbiosis (symbiosis between heterotrophs and phototrophs) because it only involves one organism and an organelle of a different organism — the chloroplasts — and not, as usual, two organisms.
Elysia chlorotica (the eastern emerald elysia) is one such, a solar powered sea slug that looks rather like a leaf.
The papers refer to this all as photosymbiosis, but I think it is a bit odd to call it this, as the heterotroph gets a free powerpack and the autotroph gets to be eaten and go to autograph heaven. “It’s the circle … the circle of life.”