Cyclocystoidea - Cyclocystoididae
Parent taxon: Cyclocystoidea according to A. B. Smith and C.R.C. Paul 1982
See also Berg-Madsen 1987, Parsley 1981 and Regnéll 1945
Sister taxa: Apycnodiscidae, Moroccodiscidae
Subtaxa: Actinodiscus Apycnodiscus Cyclocystoides Diastocycloides Monocycloides Narrawayella Nicholsodiscus Perforocycloides Polytryphocycloides Sievertsia Zygocycloides
Ecology: stationary low-level epifaunal
Distribution:
• Devonian of the Czech Republic (2 collections), United States (2: Ohio, Tennessee)
• Silurian of Canada (1: Québec), Sweden (3), United States (15: Illinois, Indiana, Iowa, Oklahoma, Tennessee)
• Volkhov of Sweden (1)
• Ordovician of Canada (3: Ontario, Quebec), the Russian Federation (1), the United Kingdom (1), United States (39: Illinois, Illinois, Iowa, Iowa, Kentucky, Minnesota, Missouri, Ohio, Oklahoma, illinois)
Total: 68 collections including 82 occurrences