Strophomenata - Billingsellida
Parent taxon: Clitambonitidina according to M. Liljeroth et al. 2017
See also Benedetto 2003, Williams et al. 2000 and Zuykov and Hints 2002
Sister taxa: Clitambonitacea, Gonambonitacea, Polytoechioidea
Subtaxa: Arctohedridae Clitambonitidae Gonambonitidae
Ecology: stationary epifaunal suspension feeder
Distribution:
• Ordovician to Silurian of Canada (3: Québec collections)
• Ordovician of Australia (1), Belarus (4), Belgium (8), Canada (26: Newfoundland, Ontario, Quebec, Québec), China (15), Estonia (159), Haiti (1), Iran (1), Ireland (6), Latvia (3), Lithuania (6), Norway (8), Poland (1), the Russian Federation (192), Sweden (8), the United Kingdom (31), United States (22: Illinois, Iowa, Minnesota, Missouri, Oklahoma, Tennessee, Virginia)
• Llandeilo of Mongolia (1)
• Chazy of United States (7: Alabama, New York)
• Whiterockian of United States (4: Nevada)
• Arenig of Argentina (1), China (1), the United Kingdom (2)
• Dawan of China (1)
• Cambrian of Australia (2), Kyrgyzstan (2), United States (1: Alaska)
Total: 517 collections including 672 occurrences