Key to the Species of Macrhybopsis

3a. (From 2a.) Belly anterior to pelvic fins with exposed scales; dark spots on head and body large and distinct; dorsal fin origin over or posterior to vertical from pelvic fin origin.
shoal chub

Macrhybopsis aestivalis hyostomus
(Tennessee R. Dr.)

3b. (From 2a.) Belly anterior to pelvic fins without scales or scales not exposed; dark spots on head and body small; dorsal fin origin slightly anterior to vertical from pelvic fin origin.
Macrhybopsis
sp. A, (lower Mobile Basin form)