| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Urticina Ehrenberg 1834 | 0 | 0 | 0 |
| Valvatida Perrier 1884 (An order of starfish) | 2 | 65 | 0 |
| Velatida Perrier 1884 | 1 | 11 | 0 |
| Virgularia mirabilis (Müller 1776) (common sea pen) | 0 | 1 | 0 |
| Xenophyophorea | 1 | 0 | 0 |
| Xiphias gladius Linnaeus 1758 (Broadbill Swordfish) | 0 | 1 | 0 |
| Xyelacyba myersi Cohen 1961 (Gargoyle cusk) | 0 | 3 | 0 |
| Zeus faber Linnaeus 1758 (Atlantic John Dory) | 0 | 6 | 0 |
