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Endemic (Wikipedia)
Montezuma Well in the Verde Valley of Arizona contains at least five endemic species found exclusively in the sinkhole.

Endemism is the state of a species being native to a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is exclusively found in southwestern South Africa and is therefore said to be endemic to that particular part of the world. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range.

A rare alternative term for a species that is endemic is 'precinctive', which applies to species (and other taxonomic levels) that are restricted to a defined geographical area.

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