Rhynchonellata - Atrypida - Cyclospiridae
Parent taxon: Protozygoidea according to A. Williams et al. 2002
See also Rõõmusoks 1964
Sister taxon: Protozygidae
Subtaxa: Cyclospira Rozmanospira
Ecology: stationary epifaunal suspension feeder
Distribution:
• Silurian of Canada (1: Northwest Territories collection), China (1), Estonia (1), Norway (4), the United Kingdom (3)
• Ordovician of Australia (1), Belgium (5), Canada (25: Northwest Territories, Nunavut, Ontario, Quebec), China (7), the Czech Republic (3), Estonia (2), Italy (2), Kazakhstan (1), Norway (1), the Russian Federation (1), Sweden (2), the United Kingdom (21), United States (25: Alaska, Georgia, Illinois, Iowa, Maine, Minnesota, Oklahoma, Virginia, Wyoming)
Total: 106 collections including 112 occurrences