Family
Orthorhynchulidae Cooper, 1956
Klassificering
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Brachiopoda |
| Subphylum | Rhynchonelliformea |
| Class | Rhynchonellata |
| Order | Rhynchonellida |
| Superfamily | Rhynchotrematoidea |
| Family | Leptocoeliidae |
| Machaerariidae | |
| Orthorhynchulidae | |
| Genus | Orthorhynchula |
| Family | Rhynchotrematidae |
| Trigonorhynchiidae |