| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Xenodermichthys | 1 | 0 | 0 |
| Xenodermichthys copei (Gill 1884) | 0 | 0 | 1 |
| Xiphias | 1 | 0 | 0 |
| Xiphias gladius Linnaeus 1758 (Miekkakala) | 0 | 0 | 1 |
| Xiphiidae (Miekkakalat) | 1 | 0 | 0 |
| Xystonellidae | 1 | 0 | 0 |
| Yoldia Møller 1842 | 2 | 0 | 0 |
| Aequiyoldia eightsii (Jay 1839) | 0 | 0 | 1 |
| Yoldia myalis (Couthouy 1838) | 0 | 0 | 1 |
| Yoldiella A. E. Verrill & Bush 1897 | 8 | 0 | 0 |
| Yoldiella expansa (Jeffreys 1876) | 0 | 0 | 1 |
| Yoldiella intermedia (M. Sars 1865) | 0 | 0 | 1 |
| Yoldiella jeffreysi (Hidalgo 1877) | 0 | 0 | 1 |
| Tanea zebra | 0 | 0 | 1 |
| Yoldiella lenticula (Møller 1842) | 0 | 0 | 1 |
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