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5B. The two terminal elements of first pleopod of Form I male
are straight and parallel to each other
Rusty crayfish, Orconectes rusticus
5C. The two terminal elements of first pleopod of Form I male
are short and have 90 degree curve
Papershell crayfish, Orconectes immunis
6A. There is no gap between the curved edges of the
aureola.
Red swamp crayfish, Procambarus
clarkii
6B. There is a small gap between the curved edges
of the aureola.
White River crayfish, Procambarus
acutus acutus
