| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acinetosporaceae | 0 | 0 | 12 |
| Acipenseridae (sturgeons) | 0 | 0 | 12 |
| Aclerdidae (aclerdid scales) | 0 | 0 | 12 |
| Aclididae | 0 | 0 | 12 |
| Aclistocharaceae | 0 | 0 | 12 |
| Acmaeidae Forbes 1850 (acmaeid sea snails) | 0 | 0 | 12 |
| Acochlidiidae Küthe 1935 | 0 | 0 | 12 |
| Acoetidae | 0 | 0 | 12 |
| Acoleidae | 0 | 0 | 12 |
| Acontiophoridae Carlgren 1938 | 0 | 0 | 12 |
| Acoraceae (sweet flag family) | 0 | 0 | 12 |
| Acoraniidae López-Fé 2006 | 0 | 0 | 12 |
| Acramoebidae | 0 | 0 | 12 |
| Acrididae (short-horned grasshoppers) | 0 | 0 | 12 |
| Acrobatidae Aplin 1987 (feathertail gliders and pygmy gliders) | 0 | 0 | 12 |
