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Calico Crayfish, Orconectes immunis: Measurements and Ratios: Female
Number Minimum Maximum Mean
Total length 19 54.9 94.8 74.3
Carapace
Total length 19 26.6 45.4 35.8
Postorbital length 19 19.5 34.4 25.9
Aureola
Total length 19 9.1 16.1 12.5
Width 19 0.5 1.3 0.8
Chela
Total length 19 14.2 32.2 23.4
Dactyl length 19 9.2 21.4 15.6
Palm length 19 3.6 8.9 6.3
Palm width 19 4.8 11.8 8.6
Finger gap 18 0.5 2.5 1.6
Antenna
Total length 17 29.2 53.3 44.6
Ratios Number Minimum Maximum Mean
Carapace length / Total length 20 0.47 0.50 0.48
Aureola length / Carapace length 20 0.33 0.37 0.35
Aureola length / Aureola width 31 11.0 24.1 15.2
Chela length / Carapace length 20 0.51 0.75 0.64
Dactyl length / Chela length 20 0.61 0.74 0.66
Palm width / Chela length 20 0.32 0.41 0.37
