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Endosymbiotic

Endopelic

Epilithic

An organism that lives inside another, benefitting both individuals, is considered to be an endosymbiont.

Image Credit: Rex Lowe

The diatom Epithemia turgida contains endosymbiotic cyanobacteria in many of the cells. The endosymbionts are visible as round bodies within the cytoplasm. In Epithemia and Rhophalodia, endosymbionts are important in fixing atmospheric nitrogen for use by the cells.