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Figure 12--Rare mussels occur in all 11 of the aquatic fauna provinces described by Parmalee and Bogan (1998). The Cumberland Province, including the Tennessee and Cumberland River systems, supports the greatest number of rare mussels.

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aquatic fauna province	Number of rare mussel species
North Atlantic	4
South Atlantic	22
Florida	9
Cumberland	60
Apalachicola	30
Mobile	43
Mississippi	49
Ozark	7
Sabine	3
Central Texas	5
Rio Grande	5