ARKive's most wanted species listed alphabetically by scientific name
| Scientific name | Common name | Status |
|---|---|---|
| Oxera balansae | EN | |
| Oxera cauliflora | VU | |
| Oxera nuda | VU | |
| Oxychaeta dicksoni | Dickson's Copper | EN |
| Oxychilus lineolatus | VU | |
| Oxychilus oglasicola | VU | |
| Oxyepoecus daguerrei | VU | |
| Oxyepoecus inquilina | VU | |
| Oxygyne triandra | CR | |
| Oxymycterus hucucha | Quechuan Hocicudo | EN |
| Oxymycterus josei | Cook’s hocicudo | EN |
| Oxystigma msoo | VU | |
| Oziothelphusa biloba | VU | |
| Oziothelphusa dakuna | EN | |
| Oziothelphusa gallicola | EN | |
| Oziothelphusa hippocastanum | VU | |
| Oziothelphusa intuta | CR | |
| Oziothelphusa kodagoda | CR | |
| Oziothelphusa populosa | EN | |
| Oziothelphusa ritigala | VU | |
| Oziothelphusa stricta | VU | |
| Oziothelphusa wagrakarowensis | VU | |
| Ozobryum ogalalense | CR |