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Calico Crayfish, Orconectes immunis: Measurements and Ratios: Form I Male
Number Minimum Maximum Mean
Total length 33 55.3 91.9 72.0
Carapace
Total length 33 27.9 47.5 35.7
Postorbital length 33 20.7 37.1 25.9
Aureola
Total length 32 322.5 0.0 0.0
Width 33 21.5 0.0 0.0
Chela
Total length 30 18.8 48.3 31.4
Dactyl length 30 12.7 31.9 21.1
Palm length 30 5.4 12.5 8.3
Palm width 30 6.7 15.2 10.7
Finger gap 29 0.0 13.2 2.6
Antenna
Total length 29 27.9 72.9 49.1
Pleopod
Total length 33 8.8 18.8 11.7
Ratios Number Minimum Maximum Mean
Carapace length / Total length 33 0.48 0.52 0.50
Aureola length / Carapace length 31 0.32 0.38 0.35
Aureola length / Aureola width 31 11.0 24.1 15.2
Chela length / Carapace length 28 0.67 1.11 0.87
Dactyl length / Chela length 28 0.61 0.71 0.67
Palm width / Chela length 28 0.31 0.38 0.34
Pleopod length/Carapace length 29 0.36 0.96 0.44
