Genus
Quadrotheca Syssoiev, 1958
List of species
1. Quadrotheca quadrangularis (Holm, 1893) | Kunda Stage
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Hyolitha |
| Order | Orthothecida |
| Family | Quadrothecidae |
| Genus | Bactrotheca |
| Quadrotheca | |
| Species | quadrangularis |