Mussels (Bivalvia, family Unionidae) from the Mountain Fork River. This is an incomplete list as some specimens are still being identified.
| Actinonaias ligamentina | mucket |
| Amblema plicata | threeridge |
| Fusconaia flava | Wabash pigtoe |
| Lampsilis cardium | plain pocketbook |
| Lampsilis siliquoidea | fatmucket |
| Lasmigona costata | flutedshell |
| Ligumia subrostrata | pondmussel |
| Obovaria jacksoniana | southern hickorynut |
| Ptychobranchus occidentalis | Ouachita kidneyshell |
| Quadrula pustulosa | pimpleback |
| Quadrula quadrula | mapleleaf |
| Strophitus undulatus | creeper |
| Toxolasma parvus | lilliput |
| Toxolasma texasensis | Texas lilliput |
| Tritogonia verrucosa | pistolgrip |
| Truncilla donaciformis | fawnsfoot |
| Villosa arkansasensis | Ouachita creekshell |
| Villosa iris | rainbow |
| Villosa lienosa | little spectaclecase |