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
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Dichotomous Key to the Crayfishes of the St. Mary's River System

1a. Two cervical spines (Fig. 1)....................Procambarus spiculifer
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. Claw tubercles reddish or orangish...Procambarus paeninsulanus
2b. Claw tubercles not reddish or orangish..............................go to 3

3a. Upper sides with two large, dark spots...Procambarus seminolae
3b. Uppers sides without large, dark spots..............................go to 4

4a. Rostrum long and pointed, usually with marginal spines or tubercles...............................................................................go to 5
4b. Rostrum shorter and spatulate without marginal spines or tubercles...............................................................................go to 6

5a. Light splotches on sides, bordered above by dark stripe................................................................Procambarus fallax
5b. No light splotches on sides; dark stripe reduced or absent............................................................Procambarus acutus

6a. Areola narrow, more than 10 times as long as broad...........................................................Procambarus talpoides
6b. Areola wider, less than 10 times as long as broad....................................................Procambarus p. pubischelae

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