†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
Distribution:
• Whiterockian of United States (1: Vermont collection)
• Chazyan of Canada (8: Quebec), United States (5: Tennessee, Vermont, Virginia)
• Ordovician of Australia (4), Canada (2: Northwest Territories), the Russian Federation (4)
Total: 24 collections each including a single occurrence