106
. Northern Crayfish, Orconectes virilis: Measurements and Ratios: Female
Number Minimum Maximum Mean
Total length 61 52.9 121.2 77.7
Carapace
Total length 61 25.9 59.3 38.4
Postorbital length 61 19.9 47.7 29.9
Aureola
Length 61 9.3 22.4 13.8
Width 61 0.4 1.5 0.9
Chela
Total length 61 14.1 53.0 29.0
Dactyl length 61 10.4 35.8 19.9
Palm length 61 3.4 13.5 7.3
Palm width 61 5.4 21.5 11.5
Finger gap 53 0.0 5.3 1.7
Antenna
Total length 56 38.1 109.5 62.5
Ratios Number Minimum Maximum Mean
Carapace length / Total length 61 0.47 0.53 0.49
Aureola length / Carapace length 61 0.34 0.38 0.36
Aureola length / Aureola width 61 10.8 39.5 17.9
Chela length / Carapace length 61 0.55 0.93 0.74
Dactyl length / Chela length 61 0.61 0.76 0.69
Palm width / Chela length 61 0.34 0.46 0.40
