monoinsular

Etymology
From.

Adjective

 * 1) Consisting of, or pertaining to, a single island.
 * 2) * 1977, Proceedings of the Hawaiian Entomological Society, vol. 22, Issue 3, p. 414:
 * Xyleborus simillimus appears to be a monoinsular endemic and forms a complex with two or three other species.