1) Biological interaction 
An epibiont is an organism that lives on the surface of another living organism. An epibiont is usually considered harmless to the host; in this sense, the relationship between the two organisms can be considered neutralistic or commensalistic. Typical epibionts are barnacles, remoras and algae, all of which live on many larger marine organisms, s...
one organism living on another, such as a barnacle attached to a sea turtle
epibiont 1. Living attached to another organism. 2. Surviving, applied to endemic species that are relics of a former flora or fauna; growing on the exterior of living organisms; living on a surface, as of the sea bottom. An antonym is hypobiotic.epibiontic, epibiont Living attached to another organism without any connotation of mutualism. Urchins and grazing fishes feed on epibionts of reefs and often scrape off bits of calcium carbonate; resulting in bioerosion.