. "Slough darter" . "Animalia" . "Etheostoma gracile (Girard 1859)" . . "Chordata" . . "Etheostoma gracile" . . "Perciformes" . . "Percidae" . . "(Girard 1859)" . "Etheostoma" . . . . . . "Actinopterygii" . . .