| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Amurosaurus Bolotsky & Kurzanov 1991 | 1 | 0 | 0 |
| Amurosaurus riabinini Bolotsky & Kurzanov 1991 | 0 | 0 | 2 |
| Anatosaurus | 1 | 0 | 1 |
| Anatosaurus annectens | 0 | 0 | 2 |
| Anatotitan | 1 | 0 | 2 |
| Anatotitan copei | 0 | 0 | 5 |
| Anchiornis Xu et al. 2009 | 1 | 0 | 0 |
| Anchiornis huxleyi Xu et al. 2009 | 0 | 0 | 2 |
| Anchisaurus Marsh 1885 | 2 | 0 | 0 |
| Anchisaurus polyzelus (Hitchcock 1865) | 0 | 0 | 5 |
| Anchisaurus sinensis | 0 | 0 | 2 |
| Andesaurus Calvo & Bonaparte 1991 | 1 | 0 | 0 |
| Andesaurus delgadoi Calvo & Bonaparte 1991 | 0 | 0 | 4 |
| Animantarx Carpenter et al. 1999 | 1 | 0 | 0 |
| Animantarx ramaljonesi Carpenter et al. 1999 | 0 | 0 | 2 |
