Headwater darter

The headwater darter (Etheostoma lawrencei) is a species of darter endemic to the eastern United States where it is found in Kentucky and Tennessee in the upper Green River system down to the Mud River, in the Cumberland River and upper Salt River systems. It is an inhabitant of streams up to about 5 metres (16 ft) wide with gravel or cobble substrates. Males of this species can reach a length of 6.2 centimetres (2.4 in) SL while females only reach 5.7 centimetres (2.2 in).