Key to the Species of Cyprinella

10a. (From 9a.) Mouth inferior; total circumferential scales usually 26, scales above lateral line usually 13, scales below lateral line usually 11; dark lateral stripe usually not extending to eye or snout; side of snout with distinct crecent-shaped line of dark pigment extending from eye to middle of upper lip.
bluestripe shiner
Cyprinella callitaenia

10b. (From 9a.) Mouth terminal to subterminal; snout may be slightly overhung in tuberculate breeding males; total cicrumferential scales usually 22, scales above lateral line usually 11, scales below lateral line usually 9; dark lateral stripe often extending to eye or snout; side of snout uniformly pigmented and without dark crescent line.
blue shiner

Cyprinella caerulea