| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Vermiliopsis Saint-Joseph 1894 | 3 | 0 | 0 |
| Vermiliopsis infundibulum (Philippi 1844) | 0 | 0 | 1 |
| Vermiliopsis monodiscus Zibrowius 1968 | 0 | 0 | 1 |
| Vermiliopsis labiata (O. G. Costa 1861) | 0 | 0 | 1 |
| Wrangeliaceae | 1 | 0 | 0 |
| Xaiva MacLeay 1838 | 1 | 0 | 0 |
| Xaiva biguttata (Risso 1816) | 0 | 0 | 1 |
| Xiphias | 1 | 0 | 0 |
| Xiphias gladius Linnaeus 1758 (Broadbill Swordfish) | 0 | 0 | 1 |
| Xiphiidae (swordfishes) | 1 | 0 | 0 |
| Ziphius G. Cuvier 1823 | 1 | 0 | 0 |
| Ziphius cavirostris G. Cuvier 1823 (Cuvier's Beaked Whale) | 0 | 0 | 1 |
| Zoantharia Gray 1832 (zoanthids) | 1 | 0 | 0 |
