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The Crayfish of Nebraska

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102 Devil Crayfish, Cambarus diogenes: Measurements and Ratios: Form II Male Number Minimum Maximum Mean Total length 11 43.7 93.6 63.8 Carapace Total length 11 22.5 51.5 35.1 Postorbital length 11 19.8 262.6 51.8 Aureola Length 11 8.8 21.7 14.1 Width 11 0.0 0.0 0.0 Chela Total length 11 13.8 43.7 24.4 Dactyl length 11 8.8 28.3 15.8 Palm length 11 3.8 12.7 7.3 Palm width 11 6.2 18.7 10.9 Finger gap 11 0.3 3.7 1.7 Antenna Total length 10 30.5 60.2 42.9 Pleopod Total length 8 4.7 12.0 8.4 Ratios Number Minimum Maximum Mean Carapace length / Total length 11 0.51 0.83 0.56 Aureola length / Carapace length 11 0.39 0.42 0.40 Chela length / Carapace length 11 0.55 0.85 0.68 Dactyl length / Chela length 11 0.60 0.69 0.65 Palm width / Chela length 11 0.41 0.48 0.45 Pleopod length / Carapace length 8 0.20 0.26 0.23

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