Etheostoma radiosum

The orangebelly darter (Etheostoma radiosum) is a species of darter endemic to the eastern United States, where it occurs in the Ouachita and Red River drainages in southwestern Arkansas and southeastern Oklahoma. It occurs in gravel and rubble riffles and runs of creeks and small to medium rivers. This species can reach a length of 8.5 cm (3.3 in).