Comments: There is some confusion regarding the taxonomy and distribution of Gulf slope Pleurobema (Brim Box and Williams, 2000). Heard (1979) listed Pleurobema pyriforme from the Apalachicola, Ochlockonee and Suwannee drainages, and included the Apalachicola River drainage in the distribution of Pleurobema strodeanum. Based upon recent genetic data (Kandl et al., 1997), Brim Box and Williams (2000) recognized only one species, P. pyriforme, from the Suwannee River drainage west to the Econfina Creek drainage, an independent coastal drainage located between the Choctawhatchee and Chipola rivers in west Florida. Therefore, the records of Pleurobema reclusum in Williams and Butler (1994) from the Suwannee and Ochlockonee rivers and Heard's (1979) records of P. strodeanum from the Apalachicola drainage are P. pyriforme. P. strodeanum occurs only in the Escambia, Choctawhatchee and Yellow rivers in west Florida and Alabama. The type locality is in the Escambia River, west Florida (Wright, 1898).
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