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3B. Rostrum does not curve down but is quite
straight with terminal spine
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4A. Terminal elements of first pleopod with sharp curve
and club shaped
Devil crawfish, Cambarus diogenes
4B. Terminal elements of first pleopod are a cluster of
several small projections.
Grassland crayfish, Procambarus gracilis
5A. The two terminal elements of first pleopod of Form I male
are long, gently curved and diverge from each other
Northern crayfish, Orconectes virilis
