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Figure 23.5--Endemism is extremely high in crustaceans. Over 90 percent of the rare aquatic crustaceans have native ranges smaller than five counties and over a third are restricted to a single county.

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Number of counties	Number of species
1	58
2	26
3	27
4	23
5	10
6	4
7	2
8	4
9	0
10	4
>10	1