| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Ancistrocheirus Gray 1849 | 0 | 0 | 1 |
| Angiola | 0 | 0 | 1 |
| Metazoa (Animal) | 14 | 0 | 0 |
| Annacrinus | 0 | 0 | 1 |
| Annelida (segmented worms) | 50 | 0 | 0 |
| Anomalops | 0 | 0 | 1 |
| Anthomastus Verrill 1878 | 0 | 0 | 1 |
| Antimora | 0 | 0 | 0 |
| Apogon | 0 | 0 | 1 |
| Apolemia Eschscholtz 1829 | 0 | 0 | 1 |
| Arachnocampa | 0 | 0 | 1 |
| Araiophos | 0 | 0 | 1 |
| Archamia (cardinalfish) | 0 | 0 | 1 |
| Argyripnus | 0 | 0 | 1 |
| Argyropelecus | 0 | 0 | 1 |
