Key to the Species of Cyprinidae
15a. (From 14b.) One or more barbels present at posterior corners of mouth, either behind junction of lower and upper lips or in a groove immediately above the upper lip (may be small and flap-like and difficult to see)
15b. (From 14b.) No barbels present at posterior corners of mouth (Note: Cyprinella monacha has a barbel and Notropis harperi sometimes has a barbel).