Dichotomous Key to the Crayfishes of the Little Tennessee River System

1a. Single, well developed, sharp cervical spine
(Fig. 1B).....................................................Cambarus georgiae
1b. At most, single cervical tubercle, or nothing..................to to 2

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

2a. Two rows of tubercles along mesial margin of
palm.................................................................Cambarus nodosus
2b. Single row of tubercles along mesial margin of palm.........go to 3

Figure 2. Dorsal view of crayfish claws indicating A) single row of tubercles along mesial margin of palm and B) more than one row of tubercles along mesial margin of palm.  Modified from Hobbs (1981).

3a. Serrate row of tubercles along mesial margin of palm (Fig. 2A); claws extremely setose, appear “hairy”.........Cambarus asperimanus
3b. Flattened row of tubercles along  mesial margin of palm; claws without setae...........................................Cambarus bartonii bartonii