The straightedge crayfish (Procambarus hayi), from the southern United States. A typically fine picture by Chris Lukhaup.
Reference
James F. Payne JF. 1972. The life history of Procambarus hayi. American Midland Naturalist 87(1): 25-35. http://dx.doi.org/10.2307/2423879
U.S. Forest Service photo on Flickr, used under a Creative Commons license.
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