Family
Quadrothecidae Malinky, 2002
Selection of related publications
Malinky, J. M., Eriksson, M. E., Ahlberg, P. 2009. ‘Mediterranean Province' hyoliths from the middle Cambrian and Upper Ordovician of Sweden. GFF 131, 4, 281-291. DOI:10.1080/11035890903458693
Dzik, J. 1980. Ontogeny of Bactrotheca and related hyoliths. GFF 102, 3, 223-233. DOI:10.1080/11035898009455162
List of species
2. Bactrotheca dens (Holm, 1893) | Uhaku Stage
3. Bactrotheca quadrangularis (Holm, 1893) | Ordovician
4. Quadrotheca quadrangularis (Holm, 1893) | Kunda Stage
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Hyolitha |
| Order | Orthothecida |
| Family | Novitatidae |
| Orthothecidae | |
| Quadrothecidae | |
| Genus | Bactrotheca |
| Quadrotheca |