inquiline

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in·qui·line

(in'kwi-līn, -lin),
An animal that lives habitually in the abode of some other species (an oyster crab within the shell of an oyster) causing little or no inconvenience to the host.
See also: commensal.
[L. inquilinus, an inhabitant of a place that is not his own, fr. in, in, + colo, to inhabit]

inquiline

(ĭn′kwə-līn′, -lĭn, ĭng′-)
n.
An animal that characteristically lives commensally in the nest, burrow, or dwelling place of an animal of another species.
adj.
Being or living as an inquiline.

in′qui·lin·ism (-lə-nĭz′əm), in′qui·lin′i·ty (-lĭn′ĭ-tē) n.
in′qui·lin′ous (-lī′nəs) adj.
References in periodicals archive ?
Even if the figitoid inquilines were considered, it is clear that inquilinism has not evolved many times among cynipids.
Even though the origin of cynipid inquilinism appears to be a unique historical event, it is tempting to speculate about possible adaptive mechanisms involved.
An alternative model for the origin of cynipid inquilinism is that it evolved from mutualistic communal oviposition behavior.
In summary, the prediction that workerless inquilinism can evolve in both obligately and facultatively sterile taxa seems well supported and the prediction of a correlation between worker fertility and a robust worker caste is also supported, with the possible exception of Strongylognathus.
However, inquilinism will not be as severely restricted by seasonality.
The evolution of inquilinism may increase the fitness of individual larvae at the expense of overall colony fitness.
That a substantial number of inquilines exist suggests that the evolution of inquilinism may be a relatively common event.