| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Xylopteryx bifida Herbulot 1984 | 0 | 0 | 1 |
| Xylopteryx clathrata | 0 | 0 | 1 |
| Xylopteryx sima Prout 1926 | 0 | 0 | 1 |
| Xymalos | 1 | 0 | 0 |
| Xymalos monospora (Harvey) Baillon (Lemon wood) | 0 | 0 | 1 |
| Xyridaceae (yellow-eyed-grass family) | 1 | 0 | 0 |
| Xyris (yelloweyed grass) | 2 | 0 | 0 |
| Xyris capensis Thunb. | 0 | 0 | 1 |
| Xyris valida Malme | 0 | 0 | 1 |
| Ypthima | 1 | 0 | 0 |
| Ypthima albida Butler 1888 | 0 | 0 | 1 |
| Yunkeracarus | 1 | 0 | 0 |
| Yunkeracarus muris | 0 | 0 | 1 |
| Zelotomys Osgood 1910 | 1 | 0 | 0 |
| Zelotomys hildegardeae (Thomas 1902) (Broad-headed Stink Mouse) | 0 | 0 | 1 |
