| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Xylariomycetidae | 1 | 0 | 0 |
| Xyleborina | 0 | 0 | 0 |
| Xyleborus | 0 | 0 | 0 |
| Xyleborus dispar Wood & Bright 1992 | 0 | 2 | 0 |
| Xylia | 0 | 2 | 0 |
| Xylocopa Latreille 1802 (Carpenter Bees) | 0 | 2 | 0 |
| Xylogone | 0 | 2 | 0 |
| Xylophis Beddome 1878 | 0 | 2 | 0 |
| Xyloryctidae (timber moths) | 1 | 0 | 0 |
| Yersinia | 1 | 0 | 0 |
| Yersinia pestis | 0 | 2 | 0 |
| Yponomeuta | 1 | 2 | 0 |
| Yponomeuta cagnagella | 0 | 2 | 0 |
| Yponomeuta evonymella Linnaeus 1758 (Bird-cherry Ermine) | 0 | 2 | 0 |
| Yponomeuta malinellus | 0 | 2 | 0 |
