Genus
Ahla Schallreuter, 1993
Klassificering
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Superclass | Oligostraca |
| Class | Ostracoda |
| Subclass | Podocopa |
| Order | Palaeocopida |
| Suborder | Beyrichicopina |
| Superfamily | Tetradelloidea |
| Family | Tetradellidae |
| Subfamily | Tetradellinae |
| Supergenus | Winchellatia |
| Genus | Ahla |
| Ceratopsis | |
| Consonopsis | |
| Dilobella | |
| Foramenella | |
| Glossopsis | |
| Ogmoopsis | |
| Pleurodella | |
| Polyceratella | |
| Tetradella | |
| Utalina |