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Calico Crayfish, Orconectes immunis: Measurements and Ratios: Form II Male
Number Minimum Maximum Mean
Total length 10 56.3 84.4 72.7
Carapace
Total length 11 28.1 42.4 36.0
Postorbital length 11 20.4 33.6 27.5
Aureola
Total length 11 9.7 16.3 13.0
Width 11 0.5 1.0 0.8
Chela
Total length 11 16.5 50.8 30.0
Dactyl length 11 10.4 33.8 19.6
Palm length 11 4.1 13.7 8.0
Palm width 11 5.7 16.0 9.8
Finger gap 9 0.8 3.6 2.0
Antenna
Total length 10 32.3 86.4 53.0
Ratios Number Minimum Maximum Mean
Carapace length / Total length 10 0.47 0.51 0.49
Aureola length / Carapace length 11 0.34 0.44 0.36
Aureola length / Aureola width 11 12.9 25.4 16.6
Chela length / Carapace length 11 0.59 1.38 0.82
Dactyl length / Chela length 11 0.61 0.68 0.65
Palm width / Chela length 11 0.30 0.35 0.33
Pleopod length/Carapace length 5 0.32 0.42 0.35
