crustacés
| Nom | Type | Notoriété | Popularité |
|---|---|---|---|
| Xantho Hydrophilus | Taxon | 9 | 0.0 |
| Xantho Pilipes | Taxon | 7 | 0.2 |
| Xantho Poressa | Taxon | 16 | 0.4 |
| Xanthoidea | Taxon | 15 | 0.6 |
| Xeinostoma Inopinatum | Taxon | 4 | 0.2 |
| Xenograpsus | Taxon | 9 | 0.2 |
| Xenomolgus Varius | Taxon | 3 | 0.0 |
| Xenophthalmidae | Taxon | 10 | 0.2 |
| Xibalbanus | Taxon | 6 | 0.0 |
| Xibalbanus Cokei | Taxon | 2 | 0.1 |
| Xibalbanus Cozumelensis | Taxon | 3 | 0.0 |
| Xibalbanus Fuchscockburni | Taxon | 3 | 0.0 |
| Xibalbanus Tulumensis | Taxon | 4 | 0.0 |
| Xiphocarididae | Taxon | 6 | 0.0 |
| Xiphonectes | Taxon | 5 | 0.0 |
| Zamolgus | Taxon | 2 | 0.0 |
| Zanthopsidae | Taxon | 3 | 0.2 |
| Zebrida Adamsii | Taxon | 8 | 0.7 |
| Zenopontonia | Taxon | 6 | 0.1 |
| Zenopontonia Soror | Taxon | 2 | 0.0 |
| Zygita | Taxon | 3 | 0.0 |
| Écrevisse | Concept | 52 | 176.7 |
| Écrevisse de Louisiane | Taxon | 32 | 55.3 |
| Écrevisse À Pattes Blanches | Taxon | 23 | 22.1 |
| Écrevisse À Pattes Rouges | Taxon | 53 | 21.2 |
| Étrille | Taxon | 22 | 43.9 |