Parent taxon: Ajacicyathina according to F. Debrenne et al. 2015
See also Kerner et al. 2011
Sister taxa: Annulocyathoidea, Erbocyathoidea, Ethmophylloidea, Lenocyathoidea, Pretiosocyathoidea, Sigmocyathoidea, Tercyathoidea, Tumulocyathoidea
Subtaxa: Ajacicyathidae Bipallicyathidae Bronchocyathidae Densocyathidae Ethmocyathidae Sajanocyathidae
Type: Thalamocyathus
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution:
• Cambrian of Antarctica (3 collections), Australia (14), Canada (12: British Columbia, Northwest Territories, Yukon), China (9), Falkland Islands (Malvinas) (2), France (1), Germany (2), Italy (12), Kazakhstan (1), Kyrgyzstan (1), Mexico (5), Mongolia (16), Morocco (23), the Russian Federation (166), Spain (7), United States (7: California, Nevada)
Total: 281 collections including 1306 occurrences