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 Suwannee 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. Mesial margin of palm longer than moveable finger................................................................Faxonella clypeata
2b. Mesial margin of palm shorter than moveable finger..........go to 3

3a. Claw tubercles reddish or orangish...................................go to 4
3b. Claw tubercles not reddish or orangish.............................go to 5

howellae paeninsulanus clarkii

Figure 2. Gonopod of Form I male of A) Procambarus howellae; B) P. paeninsulanus; C) P. clarkii. Modified from Hobbs (1989).

4a. Tip of male gonopod tapered with pointed appendages;
cephalic surface with pointed projection
(Fig. 2B).............................................Procambarus paeninsulanus
4b. Tip of male gonopod with rounded projections; cephalic surface
with rounded projection (Fig. 2C)..................Procambarus clarkii

5a. Areola narrow, greater than 10 times as long as broad.....go to 6
5b. Areola wider, less than 10 times as long as broad...............go to 7

6a. Color greenish with red highlights...........Procambarus pygmaeus
6b. Color brownish with pink or bluish hues...Procambarus talpoides

7a. Cervical spine present..............................Procambarus fallax      7b. Cervical spine usually not present, or represented by small tubercle.................................................................................go to 8

8a. Upper sides with two large, dark spots...Procambarus seminolae
8b. Upper sides without large, dark spots..................................................Procambarus p. pubischelae

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