Q
- Quadrula couchiana
- Quadrula fragosa — Rough maple leaf pearly mussel, Winged mapleleaf
- Quadrula intermedia — Cumberland monkey-face pearly mussel, Cumberland monkeyface
- Quadrula sparsa — Appalachian monkey-face pearly mussel, Appalachian monkeyface
- Quadrula stapes — Stirrup shell, Stirrupshell
- Quadrula tuberosa
- Quincuncina mitchelli — False spike
- Quinnus neilius
Read more about this topic: IUCN Red List Endangered Animal Species