Genus
Leptagonia McCoy, 1844
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Brachiopoda |
| Subphylum | Rhynchonelliformea |
| Class | Strophomenata |
| Order | Strophomenida |
| Superfamily | Strophomenoidea |
| Family | Rafinesquinidae |
| Subfamily | Leptaeninae |
| Supergenus | Kiaeromena |
| Genus | Bekkeromena |
| Harjumena | |
| Lepidoleptaena | |
| Leptaena | |
| Leptaenopoma | |
| Leptagonia |