Noturus lachneri Taylor 1969
Identification: The Ouachita Madtom is similar to the Tadpole Madtom, Noturus gyrinus, but can be distinguished by its shorter, flatter head and its more slender body. The body is tan, dark gray or brown above and white below. The fins sometimes have dark borders. To 4 in. (10 cm) total length.
Range: The Ouachita Madtom is found in the upper Saline River system and in an adjacent small tributary of the Ouachita River in central Arkansas. This species is uncommon.
Habitat: The Ouachita Madtom inhabits flowing rocky pools and runs of creeks and small rivers.
Similar species: The Tadpole Madtom, Noturus gyrinus, has a longer and more rounded head, and a chubbier body.