Crayfishes of Georgia
Crayfishes of Georgia Overview List of Georgia Species Species Lists by Drainage Crayfish Identification Keys by Drainage Ecology and Life History Links and Other Useful Information Glossary
spacer

Dichotomous Key to the Crayfishes of the Canoochee River System

1a. Two cervical spines (Fig. 1).......................Procambarus petersi
1b. One or zero cervical spines..............................................go to 2

cervical spines

Figure 1. Lateral view of crayfish indicating number and position of cervical spines. Modified from Hobbs (1981).

2a. Claws with red or orange tubercles......Procambarus troglodytes
2b. Claws without red or orange tubercles..............................go to 3

3a. Cervical spines or tubercles present; rostrum long, often with marginal spines.....................................................................go to 4
3b. Cervical spines and tubercles absent; rostrum shorter, no
marginal spines....................................................................go to 6

4a. Length of areola six times or more longer than areola width; dark horizontal stripe on upper sides of carapace..........Procambarus lunzi
4b. Length of areola less than 6 times longer than areola width..go to 5

 epicyrtus litosternum web

Figure 2. Left gonopods of male Procambarus epicyrtus: A) Form II, B) Form I and  P. litosternum: C) Form II, D) Form I.  Modified from Hobbs (1981).

5a. Distal one-fourth of male gonopod angled caudally; caudomedial process bulbous (Figs. 2A, B)...................Procambarus epicyrtus
5b. Distal one-fourth of male gonopod not angled caudally;
caudomedial process long, finger-like
(Figs 2C, D)............................................Procambarus litosternum

6a. Length of areola usually greater than 10 times longer than broad; claw never with dense setae along the mesial margin of the
palm......................................................................................go to 7
6b. Length of areola less than 10 times longer than broad; claws of
male usually with dense setae along mesial margin of the palm............................................................Procambarus barbatus

7a. Color greenish with red highlights...........Procambarus pygmaeus
7b. Color brownish with pink or bluish hues...........................go to 8

advena truculentus web

Figure 3. Left gonopods of A) Form II Procambarus advena; B) Form I P. advena; C) Form II P. truculentus; D) Form I P. truculentus. Modified from Hobbs (1981).

8a. Male gonopod hatchet shaped (Figs. 3C, D); rostrum broad,spatulate..........................................Procambarus truculentus
8b. Male gonopod not hatchet shaped (Figs. 3A, B); rostrum
narrower, pointed........................................... Procambarus advena

dougherty
CONNECTING WHAT MATTERS
A-Z Sitewide Index
About the site
Georgia College • 231 W. Hancock St. • Milledgeville, GA 31061 • 1-800-342-0471 ; 478-445-5004 • admissions@gcsu.edu