| Label | Id | |
|---|---|---|
| Atasthalomorpha | 433081 | |
| Ateleopodidae | 143304 | |
| Ateleopodiformes | 143303 | |
| Ateleopus | 143305 | |
| Attalus | 433082 | |
| Atya | 454331 | |
| Audreyjarvisvirus | 2843351 | |
| Aulonium | 433083 | |
| Aureicoccus | 1433989 | |
| Aureivirga | 1433990 | |
| Austrozephyrus | 544332 | |
| Avanivirus | 2843352 | |
| Axinotarsus | 433084 | |
| Ayohtrevirus | 2843353 | |
| Babamunida | 433455 |