Strophomenata - Billingsellida
Parent taxon: Clitambonitidina according to A. Williams et al. 2000
See also Popov et al. 2009
Sister taxa: Clitambonitacea, Clitambonitoidea, Gonambonitacea
Subtaxa: Polytoechiidae Tritoechiidae
Ecology: stationary epifaunal suspension feeder
Distribution:
• Chazyan of United States (4: Alabama, Tennessee collections)
• Whiterockian of United States (4: Nevada, Utah)
• Volkhov of Estonia (5), the Russian Federation (60)
• Vaana of Estonia (1)
• Arenigian of Argentina (4), United States (1: Nevada)
• Arenig of Argentina (8), Canada (1: New Brunswick), China (27), Greenland (1), the United Kingdom (1), United States (1: Nevada)
• Dawan of China (6)
• Ordovician of Argentina (3), Australia (13), Canada (12: Alberta, Newfoundland, Newfoundland and Labrador, Quebec), China (23), Estonia (3), Iran (4), Ireland (1), Kazakhstan (25), Norway (3), the Russian Federation (25), Sweden (5), the United Kingdom (2), United States (31: Alabama, Arkansas, Idaho, Maine, Missouri, Nevada, Oklahoma, Tennessee, Utah)
• Canadian of Canada (4: Northwest Territories), United States (1: Maryland)
• Tremadoc of Argentina (3), China (13), the Czech Republic (4), Iran (8)
• Ibexian of United States (2: Nevada)
Total: 309 collections including 406 occurrences