| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Abietinella | 1 | 0 | 0 |
| Abietinella abietina Fleischer 1923 | 0 | 0 | 1 |
| Abothrium | 1 | 0 | 0 |
| Abothrium gadi Van Beneden 1871 | 0 | 0 | 1 |
| Acanthis Borkhausen 1797 | 2 | 0 | 0 |
| Acanthis flammea (Linnaeus 1758) | 0 | 0 | 1 |
| Acanthis hornemanni (Holböll 1843) | 0 | 0 | 1 |
| Acanthocarpus Stimpson 1871 | 1 | 0 | 0 |
| Acanthocarpus alexandri Stimpson 1871 | 0 | 0 | 1 |
| Acanthocyclops Kiefer 1927 | 1 | 0 | 0 |
| Acanthocyclops robustus | 0 | 0 | 1 |
| Acanthoecaceae | 1 | 0 | 0 |
| Acanthoecidae | 0 | 0 | 0 |
| Acanthonotozoma Boeck 1876 | 4 | 0 | 0 |
| Acanthonotozoma cristatum (Ross 1835) | 0 | 0 | 1 |
