†family Billingsariidae Okulitch 1936 (tabulate coral)
Anthozoa - Sarcinulida - Billingsariidae
Parent taxon: Sarcinulida according to D. Hill 1981
See also Klaamann 1966
Sister taxa: Columnopora, Lessnikovaea, Syringophyllidae
Subtaxa: Billingsariinae Foerstephyllinae Nyctoporinae
Ecology: stationary epifaunal suspension feeder-photosymbiotic
Distribution:
• Silurian of China (1 collection)
• Chazyan of Canada (8: Quebec), United States (8: Tennessee, Vermont, Virginia)
• Whiterockian of United States (1: Vermont)
• Ordovician of Australia (6), Canada (10: Northwest Territories, Nunavut, Ontario, Quebec), China (2), the Russian Federation (4), United States (14: Alabama, Kentucky, New York, Tennessee, Wisconsin, Wyoming)
Total: 54 collections including 57 occurrences