Order
Orthothecida Marek, 1966
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
Malinky, J. M., Berg-Madsen, V. 1999. A revision of Holm's Early and Early Mid Cambrian hyoliths of Sweden. Palaeontology 42, 1, 25-65. DOI:10.1111/1475-4983.00061
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
5. Decoritheca affinis (Holm, 1893) | Middle Cambrian (old nomenclature)
8. Quadrotheca quadrangularis (Holm, 1893) | Kunda Stage
9. Semielliptotheca rosmara (Holm, 1893) | Kunda Stage
10. Trapezotheca aemula (Holm, 1893) | Kunda Stage
11. Trapezotheca dens (Holm, 1893) | Kunda Stage
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Hyolitha |
| Order | Aimitidae |
| Allathecidae | |
| Hyolithida | |
| Orthothecida | |
| Family | Novitatidae |
| Orthothecidae | |
| Quadrothecidae | |
| Circothecidae |