A small colorless fish with a flattened head and slightly protruding lower jaw; tail fin is rounded. Cavefish live most or all of their lives in total darkness and lack eyes.
Two other cavefish species are found in Missouri. The spring cavefish is known from only one site near Cape Girardeau. The southern cavefish lives in the central and southeastern Ozark region. It is hard to distinguish the Ozark cavefish from the southern cavefish, but their ranges do not overlap.