From Physorg….

As their first meal, the sea slugs suck out the cellular contents of their algal prey and retain the green chloroplasts in cells lining their digestive gut. With this special type of symbiosis, the sea slugs never need to eat again; instead, they survive for months on sunlight and air – just like a plant – by carrying out photosynthesis.

Rumpho-Kennedy’s work, recently published in the “Proceedings of the National Academy of Sciences USA,” explains the possibility that when the sea slug feeds on its algal prey it not only acquires chloroplasts, but also algal nuclear DNA.