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 Flint River System

1a. Crayfish albinistic..............................Cambarus cryptodytes
1b. Crayfish pigmented....................................................go to 2

cervical spines

2a. Two cervical spines (Fig. 1)...........................................go to 3
2b. One or zero cervical spines............................................go to 4

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

3a. Found in the Muckalee and Coolewahee creek systems..........................................................Procambarus gibbus
3b. Found in remainder of Flint River system....Procambarus spiculifer

4a. Mesial margin of palm longer than moveable finger....................................................................Faxonella clypeata
4b. Mesial margin of palm not longer than moveable finger.......go to 5

5a. Length of mesial margin of the palm greater than width of palm (sometimes about equal on females).......................................go to 6
5b. Length of mesial margin of palm less than width of palm..go to 10

6a. Claw tubercles reddish or orangish....................................go to 7
6b. Claw tubercles not reddish or orangish..............................go to 9

howellae paeninsulanus clarkii

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

7a. Cephalic process on male gonopod pointed
(Fig 2B)..............................................Procambarus paeninsulanus
7b. Cephalic process on male gonopod rounded
(Figs. 2A,C)...........................................................................go to 8

8a. Tip of male gonopod pointed....................Procambarus howellae
8b. Tip of male gonopod rounded.....................Procambarus clarkii

9a. Carapace with two spots on each side.....Procambarus seminolae
9b. Carapace without spots on each side............Procambarus acutus


depressicambarus talpoides claw webFigure 3. A) Claw of Procambarus talpoides indicating jagged tubercles along mesial margin of palm versus B) more typical margin of crayfish palm with smaller, similar sized tubercles.  Modified from Hobbs (1981).

10a. Mesial margin of palm with jagged irregular tubercles
(Fig. 3A)........................................................Procambarus talpoides
10b. Mesial margin of palm with similar sized tubercles
(Fig. 3B)................................................................................go to 11

11a. Claws with dark, irregular splotches..............Orconectes palmeri
11b. Claws without dark splotches...........................................to to 12

12a. Mesial margin of palm with more than two rows of tubercles.............................................................Cambarus diogenes
12b. Mesial margin of palm with two rows of tubercles...........go to 13

13a. Color blue, particularly on the claws...................Cambarus harti
13b. Not blue.........................................................................go to 14

striatus latimanus dorsal web

Figure 4. Dorsal view of A) Cambarus striatus showing typically narrower areola than areola of B) Cambarus latimanus.  Modified from Hobbs (1981).

14a. Areola usually more than 9 times as long as broad and often obliterated (Fig. 4A); rostrum typically somewhat blunt; some populations with distinct abdominal stripes; cervical spines never present...............................................................Cambarus striatus
Note: Cambarus doughertyensis also keys here but is currently known only from the Albany Nursery Wildlife Management Area in Dougherty County. Cambarus doughertyensis has an obliterated areola.
14b. Areola usually less than 9 times as long as broad (Fig. 4B); rostrum tapering; some individuals with indistinct abdominal stripes; cervical spines sometimes present, especially in
juveniles...........................................................Cambarus latimanus

dougherty
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