| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Abarenicola Wells 1959 | 1 | 0 | 0 |
| Abarenicola pacifica Healy & Wells 1959 | 0 | 0 | 1 |
| Abietinaria Kirchenpauer 1884 | 3 | 0 | 0 |
| Abietinaria abietina (Linnaeus 1758) (abiétinaire) | 0 | 0 | 1 |
| Abietinaria turgida | 0 | 0 | 1 |
| Abietinaria variabilis (Clark 1877) | 0 | 0 | 1 |
| Abyssocladia Lévi 1964 | 1 | 0 | 0 |
| Abyssocladia flagrum (Lehnert, Stone & Heimler 2006) | 0 | 0 | 1 |
| Abyssocucumis Heding 1942 | 1 | 0 | 0 |
| Abyssocucumis abyssorum (Théel 1886) | 0 | 0 | 2 |
| Acalathus | 1 | 0 | 0 |
| Acalathus (Procalathus) advena (Le Conte 1846) | 0 | 0 | 1 |
| Acanthocephala | 1 | 0 | 0 |
| Acanthochondria Oakley 1930 | 1 | 0 | 0 |
| Acanthochondria cornuta (Müller O. F. 1776) | 0 | 0 | 1 |
