| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Abies vejarii Martínez (Vejar's Fir) | 0 | 0 | 1 |
| Ablautus | 1 | 0 | 0 |
| Ablautus coquilletti Wilcox 1935 | 0 | 0 | 1 |
| Ablennes | 1 | 0 | 0 |
| Ablennes hians (Valenciennes 1846) (Flat Needlefish) | 0 | 0 | 1 |
| Aboma | 1 | 0 | 0 |
| Aboma etheostoma Jordan & Starks 1895 (Scaly boy) | 0 | 0 | 1 |
| Abortiporus | 1 | 0 | 0 |
| Abortiporus biennis (Bull.) Singer 1944 | 0 | 0 | 1 |
| Abra Lamarck 1818 | 1 | 0 | 0 |
| Abra aequalis (Say 1822) (common Atlantic abra) | 0 | 0 | 1 |
| Abra palmeri Dall 1915 | 0 | 0 | 1 |
| Abra tepocana Dall 1915 | 0 | 0 | 1 |
| Abracris | 1 | 0 | 0 |
| Abracris flavolineata (De Geer 1773) | 0 | 0 | 1 |
