From ZooTerms (Dictionary of Invertebrate Zoology)
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inquiline (noun; Latin inquilinus, tenant): 1. A commensal organism that lives habitually on or within the body of another, or in its nest or abode without benefit or damage to either; a guest. See also inquilinism.

2. An animal that lives in the home of another species and derives a share of its food

See also: inquilinism. 3. An insect developing inside a gall produced by another species.