†family Tetradiidae Nicholson 1879 (tabulate coral)
Anthozoa - Tetradiida - Tetradiidae
Parent taxon: Tetradiida according to E. Klaamann 1966
See also Murray 1985
Sister taxon: Paleoalveolitidae
Subtaxa: Paratetradium Phytopsis Rhabdotetradium
Ecology: stationary epifaunal suspension feeder-photosymbiotic
Distribution:
• Ordovician of Canada (4: Manitoba, Nunavut, Quebec, Québec collections), China (10), Estonia (3), Kazakhstan (1), the Russian Federation (7)
Total: 25 collections including 29 occurrences