Mussels (Bivalvia, family Unionidae) known from the Ouachita River. This is an incomplete list as some specimens are still being identified. * Not found in this study, but known to occur further downstream (Posey, W. R. 1997. Location, species composition and community estimates for mussel beds in the St. Francis and Ouachita Rivers in Arkansas. M.S. thesis, Arkansas State University. 178 pp.)
| Alasmidonta marginata | elktoe |
| Alasmidonta sp | |
| Actinonaias ligamentina | mucket |
| Amblema plicata | threeridge |
| Arkansia wheeleri | Ouachita rock-pocketbook* |
| Cyprogenia aberti | western fanshell |
| Elliptio crassidens | elephantear |
| Elliptio dilatata | spike |
| Ellipsaria lineolata | butterfly |
| Fusconaia flava | Wabash pigtoe |
| Fusconaia ebena | ebonyshell |
| Lampsilis abrubta | pink mucket* |
| Lampsilis cardium | plain pocketbook |
| Lampsilis hydiana | Louisiana fatmucket* |
| Lampsilis satura | sandbank pocketbook |
| Lampsilis siliquoidea | fatmucket |
| Lampsilis teres | yellow sandshell |
| Lasmigona costata | flutedshell |
| Leptodea fragilis | fragile papershell |
| Ligumia recta black | sandshell |
| Ligumia subrostrata | pondmussel |
| Megalonaias nervosa | washboard* |
| Obliquaria reflexa | threehorn wartyback |
| Obovaria jacksoniana | southern hickorynut |
| Potamilus ohiensis | pink papershell* |
| Potamilus purpuratus | bleufer |
| Plectomerus dombeyanus | bankclimber* |
| Pleurobema sintoxia | round pigtoe |
| Pleurobema rubrum | pyramid pigtoe* |
| Ptychobranchus occidentalis | Ouachita kidneyshell |
| Quadrula cylindrica | rabbitsfoot |
| Quadrula metanevra | monkeyface |
| Quadrula nodulata | wartyback* |
| Quadrula pustulosa | pimpleback |
| Quadrula quadrula | mapleleaf |
| Strophitus undulatus | creeper |
| Toxolasma parvus | lilliput |
| Tritogonia verrucosa | pistolgrip |
| Truncilla donaciformis | fawnsfoot |
| Truncilla truncata | deertoe |
| Utterbackia imbecillis | paper pondshell |
| Villosa iris | rainbow |
| Villosa lienosa | little spectaclecase |