endosymbiosis
Form of symbiosis in which one organism lives inside the other
Ichthyological terms, not general ones.
Form of symbiosis in which one organism lives inside the other
Any member of the yellow-green algae genus Symbiodinium, comprising unicellular, flagellate protozoa that exist within the cells of other protozoa and some invertebrates, especially corals. They thus form an endosymbiosis in which they can provide up to 90% of the host's energy requirements.