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The Crayfish of Nebraska

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136 IDENTIFICATION KEY TO NEBRASKA'S CRAYFISHES 1A. Carapace covered with small tubercles giving it the appearance and feel of coarse sandpaper Go to 6 1B. Carapace relatively smooth with many small pits but few or no tubercles. Go to 2 2A. Rostrum with median carina or "bump" in groove (see arrow) Ringed crayfish, Orconectes neglectus 2B. Rostrum without median carina Go to 3 3A. Rostrum short, blunt and curves down Go to 4

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