110
Ringed Crayfish, Orconectes neglectus: Measurements and Ratios: Form I Male
Number Minimum Maximum Mean
Total length 28 44.1 91.1 70.6
Carapace
Total length 28 21.4 46.0 35.1
Postorbital length 28 16.9 37.6 25.9
Aureola
Length 28 7.6 16.9 12.5
Width 28 1.3 3.8 2.3
Chela
Total length 27 17.8 53.6 34.9
Dactyl length 27 11.4 34.5 22.6
Palm length 28 5.5 17.3 10.7
Palm width 28 8.0 24.6 15.6
Finger gap 28 0.8 6.6 3.1
Antenna
Total length 24 25.4 74.9 56.0
Pleopod
Total length 27 9.1 18.2 14.3
Central projection 25 2.9 6.5 5.0
Ratios Number Minimum Maximum Mean
Carapace length / Total length 28.00 0.47 0.52 0.50
Aureola length / Carapace length 28.00 0.34 0.37 0.36
Aureola length / Aureola width 28.00 3.9 7.9 5.5
Chela length / Carapace length 27.00 0.65 1.17 0.97
Dactyl length / Chela length 26.00 0.61 0.73 0.65
Palm width / Chela length 27.00 0.41 0.52 0.45
Pleopod length / Carapace length 27.00 0.36 0.45 0.41
Central Projection length / Pleopod length 25.00 0.27 0.41 0.35
