Ectosymbiosis
Encyclopedia
Ectosymbiosis is symbiosis
Symbiosis
Symbiosis is close and often long-term interaction between different biological species. In 1877 Bennett used the word symbiosis to describe the mutualistic relationship in lichens...

 in which the symbiont lives on the body surface of the host
Host (biology)
In biology, a host is an organism that harbors a parasite, or a mutual or commensal symbiont, typically providing nourishment and shelter. In botany, a host plant is one that supplies food resources and substrate for certain insects or other fauna...

, including internal surfaces such as the lining of the digestive tube and the ducts of glands.
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