Campostoma oligolepis

Regarded as a valid species by most workers since the 1970s (see Lee et al. 1980). Certain populations were included under the name C. anomalum by Lee et al. (1980); Campostoma nomenclature used by Lee et al. (1980) is out of date due to taxonomic reallocations and description of a new species; see instead Burr and Cashner (1983) and Page and Burr (1991). Hybridizes with C. paicuradii in the Chestatee River (Apalachicola drainage), Georgia, and possibly in Tennessee River tributaries in northern Georgia (or perhaps the latter apparent hybrids actually represent a cryptic form of Campostoma ); hybridization occurs in an area disturbed by reservoir construction (Burr and Cashner 1983). See Buth and Burr (1978) for information on isozyme variability in the genus Campostoma .

Relatively widespread distribution in eastern U.S.; common in some areas, but status is undetermined in many other areas.

Range includes the upper Mississippi River and Lake Michigan drainages of Wisconsin, eastern Minnesota, eastern Iowa, and northern Illinois; Ozarkian streams of central and southern Missouri, northern Arkansas, and extreme northeastern Oklahoma; Mobile Bay drainage, Georgia, Alabama, and eastern Mississippi; parts of the Green, Cumberland, and Tennessee river drainages from Kentucky to Alabama and east to Virginia and North Carolina; introduced in Escambia River, Alabama; extirpated from central Illinois (Page and Burr 2011).

This species is represented by a large number of occurrences (subpopulations). Lee et al. (1980) mapped about 250 collection sites in the upper Mississippi River basin.

Threats include siltation, reduced river flow due to domestic and industrial water use, and flood control projects.