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 Satilla 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.................................go to 3
2b. Claw tubercles not reddish or orangish...........................go to 4

howellae paeninsulanus clarkii

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

3a. Tip of male gonopod tapered with pointed appendages;
cephalic surface with pointed projection
(Fig. 2B)..........................................Procambarus paeninsulanus
3b. Tip of male gonopod with rounded projections; cephalic surface
with rounded projection (Fig. 2C)...................Procambarus clarkii

4a. Upper sides with two large, dark spots...Procambarus seminolae
4b. Upper sides without large, dark spots...............................go to 5

5a. Cervical spines or tubercles present (may be small), rostrum long and tapered, often with marginal spines.................................go to 6
5b. Cervical spines and tubercles absent, rostrum shorter, without marginal spines.....................................................................go to 7

fallax lunzi web

Figure 3. Reproductive structures of A-C, Procambarus fallax, and D-F, P. lunzi. A, D: female annulus ventralis and sternum; B, E: gonopod of Form II male; C, F: gonopod of Form I male. Modified from Hobbs (1981).

6a. Female sternum with tubercles (Fig. 3D); male gonopod bent caudally (Figs. 3E, F)........................................Procambarus lunzi
6b. Female sternum without tubercles (Fig. 3A); male gonopod nearly straight (Figs. 3B, C).........................................Procambarus fallax

7a. Areola narrow, greater than 10 times as long as broad......go to 8
7b. Areola wider, less than 10 times as long as broad.............go to 10

8a. Color greenish with red highlights...........Procambarus pygmaeus
8b. Color brownish with pink or bluish hues............................go to 9

talpoides caritus web 

Figure 4. A-C: Procambarus caritus and D-F: Procambarus talpoides. A) annulus ventralis of female indicating extensive tuberculation; B-C) gonopods of Form II and Form I male, respectively indicating lack of cephalic process and central projection fingernail-like; D) annulus ventralis of female indicating very limited or no tuberculation; E-F) gonopods of Form II and Form I male, respectively indicating presence of cephalic process and central projection beak-like. Modified from Hobbs (1981).

9a. Female annulus ventralis with extensive tuberculation (Fig 3A); central projection of male gonopod fingernail-like, cephalic process absent (Figs. 3B, C)........................................Procambarus caritus
9b. Female annulus ventralis with extremely reduce, or no tuberculation (Fig. 3D); central projection of male gonopod beak-like, cephalic process present (Figs. 3E, F)......Procambarus talpoides

deficiens pubischelae web

Figure 5. A) Annulus ventralis of Procambarus pubischelae deficiens showing no tuberculation; B) third walking leg of P. p. deficiens indicating absences of hook; C) annulus ventralis of P. p. pubischelae showing tuberculation; D) third walking leg of P. p. pubischelae indicating presence of hook. Modified from Hobbs (1981).

10a. Tuberculation absent on cephalic side of annulus ventralis
of female; male lacking hook on third leg
(Figs. 5A, B)....................Procambarus pubischelae deficiens
10b. Tuberculation present on cephalic side of annulus ventralis of female; male with hook on third leg
(Figs. 5C, D).......................Procambarus pubischelae pubischelae

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