| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Xylobolus | 1 | 0 | 0 |
| Xylobolus frustulatus (Pers.) P. Karst. 1881 (Ceramic fungus) | 0 | 2 | 0 |
| Xylocopa Latreille 1802 (Carpenter Bees) | 1 | 0 | 0 |
| Xylocopa valga Gerstäcker 1872 | 0 | 2 | 0 |
| Xyloryctidae (timber moths) | 1 | 0 | 0 |
| Xylotrechus | 1 | 2 | 0 |
| Xylotrechus (Rusticoclytus) rusticus (Linné 1758) | 0 | 2 | 0 |
| Xyrauchen | 1 | 0 | 0 |
| Xyrauchen texanus (Abbott 1860) (Razorback Sucker) | 0 | 2 | 0 |
| Xyrichtys | 0 | 2 | 0 |
| Lutrinae | 0 | 2 | 0 |
| Yponomeutidae (ermine moths) | 0 | 1 | 0 |
| Yponomeutoidea (Ermine Moths and kin) | 4 | 0 | 0 |
| Ypsolophidae | 0 | 1 | 0 |
| Yucca (yucca) | 1 | 2 | 0 |
