70 
John E. Cooper and Martha Riser Cooper 
Table 1. Measurements (mm) of types, Orconectes ( P .) carolinensis, new 
species. 
Holotype 
Allotype 
Morphotype 
Carapace 
Total length 
29.2 
29.7 
23.9 
Postorbital length 
20.5 
20.9 
17.1 
Width 
14.1 
14.0 
10.9 
Depth 
11.4 
12.7 
9.8 
Rostrum 
Length 
9.1 
9.3 
7.3 
Width at base 
4.2 
4.4 
3.7 
Length acumen 
4.4 
4.5 
3.5 
Areola 
Length 
8.6 
9.1 
7.1 
Width 
2.1 
2.3 
1.7 
Antennal scale 
Length 
7.8 
8.2 
6.6 
Width 
2.5 
2.8 
2.3 
Abdomen 
Length 
33.5 
34.7 
27.1 
Width 
10.9 
11.5 
9.0 
Cheliped (right) 
Length lateral margin chela 
24.5 
17.6 
16.7* 
Length mesial margin palm 
7.2 
5.7 
5.1* 
Width palm 
9.2 
7.0 
6.3* 
Depth palm 
5.6 
4.4 
3.7* 
Length dactyl 
13.7 
9.5 
9.1* 
Length carpus 
7.9 
7.3 
5.9 
Width carpus 
5.4 
4.7 
4.3 
Depth carpus 
4.7 
4.0 
3.3 
Length dorsal margin merus 
10.7 
9.3 
7.8 
Depth merus 
5.0 
5.1 
4.1 
Gonopod length 
13.1 
NA 
10.5 
* Left chela. 
margins bearing long marginal spine at base of acumen each side; 
rostrum subrectangular, margins converging very slightly to base of 
marginal spines; walls and floor of rostrum with setose punctations, 
proximal portion of floor cephalodorsally acclivous, floor of acumen 
plane. Acumen length 48.4 percent of rostrum length, strongly tapering 
from base to acute, corneous tip, which extending to distal margin 
of second article of antennular flagellum. Subrostral ridge strong, evident 
in dorsal aspect from base of rostrum to marginal spines. 
