†family Cyclocystoididae Miller 1882

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 Polytryphocycloides Sievertsia Zygocycloides

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Ecology: stationary low-level epifaunal


• Devonian of the Czech Republic (2 collections), United States (1: Tennessee)

• Silurian of Sweden (3), United States (15: Illinois, Indiana, Iowa, Oklahoma, Tennessee)

• Ordovician of Canada (3: Ontario, Quebec), the Russian Federation (1), Sweden (1), the United Kingdom (1), United States (39: Illinois, Illinois, Iowa, Iowa, Kentucky, Minnesota, Missouri, Ohio, Oklahoma, illinois)

Total: 66 collections including 80 occurrences

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