Some of this post gets very technical* but the general idea and what they have discovered is pretty damn amazing- a species of salamander has green algae in its cells. Those found in the eggs provide needed infusions of oxygen and changes to their metabolism.
What I don't see in the article is if the algae survives in the adult animals. If it does, that has some very interesting implications for the salamander's capacity to survive harsher environments.
* It is the biochemistry that is above my head. Never got much into that field.