†subfamily Billingsariinae Okulitch 1936 (tabulate coral)
Anthozoa - Sarcinulida - Billingsariidae
Parent taxon: Billingsariidae according to D. Hill 1981
Sister taxa: Foerstephyllinae, Nyctoporinae
Subtaxa: Billingsaria
Ecology: stationary epifaunal suspension feeder-photosymbiotic
Distribution:
• Chazyan of Canada (8: Quebec collections), United States (5: Tennessee, Vermont, Virginia)
• Whiterockian of United States (1: Vermont)
• Ordovician of Australia (4), Canada (2: Northwest Territories), the Russian Federation (4)
Total: 24 collections each including a single occurrence