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