2a. (From 1b.) Body terete and slender in shape, not highly arched at dorsal fin origin; tubercles of breeding males on side and top of head.
bigeye chub
Hybopsis amblops

2b. (From 1b.) Body deep, deepest portion at dorsal fin origin where highly arched; tubercles of breeding males only on the side of the head and above orbit.
clear chub
Hybopsis winchelli