Allohistium
Allohistium is a genus of freshwater ray-finned fish which is classified in the subfamily Etheostomatinae, commonly known as the darters, part of the family Percidae which also includes the perches, ruffes and pikeperches. They are found in the rivers of Virginia, Kentucky, Tennessee and Georgia, in the Tennessee River, Duck [River (Tennessee)|Duck River] and Cumberland River drainages.