List of symbiotic organisms

This is a list of organisms that are true symbiotes with other organisms. For more information on this topic, see main article: Symbiosis.

When discussing any symbiosis, at least two creatures are involved. For simplification, the smaller of the two symbiotes is listed first in this list.

Endosymbiotes

(endo = within; smaller symbiotes that live inside the other symbiotic organism)

Monocellular Organisms

Helicobacter pylori to humans (in stomach)
Zoochlorella to Paramecium bursaria (in cytoplasm)
Serratia symbiotica to the Black bean aphid
Microsporidia to a variety of animals, including humans.

Multicellular Organisms

Lichen comprising fungi and algae or cyanobacteria
The ant Pseudomyrmex ferruginea and the acacia tree Vachellia cornigera
Arbuscular mycorrhizal fungi form relationships with most [plant]s

Fictional endosymbiotes

Goa'uld to bipeds in Stargate SG-1
Trill (Star Trek) to bipeds in Star Trek: Deep Space Nine
Yeerks to bipeds in Animorphs
Midichlorians to other organisms in Star Wars
Sentient Worms to humans in Futurama episode Parasites Lost
Iskoort in Animorphs
Babel fish to sentients in The Hitchhiker's Guide to the Galaxy
Vindrizi from "Exogenesis," in season 4 of Babylon 5
Kergillians from the Over the Edge tabletop roleplaying game (and related card game)
Gnoph and humans
Worm fur to Chtorran gastropedes in War Against The Chtorr

Ectosymbiotes

(ecto = outside; symbiotes that live on but not within larger symbiotic hosts, for example, attached to their skin)

Mycorrhiza - Fungi live on the surface of the roots of most Vascular Plants

Fictional ectosymbiotes

Venom to Peter Parker and other humans in Marvel Comics
Carnage to humans in Marvel Comics
The Indowy's "fur" to Indowy in the Legacy of the Aldenata

Independent symbiotes

(living in proximity and relying on one another for essential biological functions)

Vertebrates

Remora and Sharks