Endemism* (explanatory note)
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The term endemism is used here to express the number of endemic species as a percentage of the total number of species in a certain country, region, genus, family, or order.

Introduced, extinct, unconfirmed, and unnamed species are not included in the total number of species.

Example:
"Country X" has 96 species of which 12 are endemic.
The endemism is:
12/96 = 0.125 = 12.5 %