Rank MethodExpertise without calculation
Review Date2015-08-17
Change Date1996-09-18
Edition Date2011-11-17
Edition AuthorsHammerson, G.
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences> 300
Range Extent CommentsRange includes the Atlantic Slope of North America from the St. Lawrence River drainage, Quebec, to the Potomac River drainage, Virginia; Great Lakes (except Lake Superior), Hudson Bay (Red River), and Mississippi River basins from Ontario and New York to southeastern North Dakota and south to eastern Oklahoma and northern Alabama, with isolated populations in the Ozark region (Page and Burr 2011).