Rank MethodExpertise without calculation
Review Date2011-12-07
Change Date1996-09-23
Edition Date2011-12-07
Edition AuthorsHammerson, G.
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences81 - 300
Range Extent CommentsRange includes the Great Lakes and Mississippi River basins from Minnesota to southern Ontario and New York, south to northern Arkansas, northern Alabama, and northern Georgia; disjunct populations occur along the lower Mississippi River in eastern Louisiana and southwestern Mississippi and in the upper Potomac River drainage (Atlantic Slope), West Virginia; abundant (Page and Burr 2011).