Rhynchonellata - Orthida - Finkelnburgiidae
Parent taxon: Plectorthoidea according to J. Hansen and L. E. Holmer 2011
See also Neuman and Bruton 1974, Williams et al. 2000 and Zhan et al. 2010
Sister taxa: Apatoskenidioides, Chilcorthidae, Cremnorthidae, Cyclocoeliidae, Eoorthidae, Euorthisinidae, Giraldiellidae, Lebediorthis, Nanorthidae, Phragmorthidae, Platystrophiidae, Plectorthidae, Ranorthidae, Rhactorthidae, Tasmanorthidae, Wangyuiidae
Subtaxa: Diparelasma Fasciculina Finkelnburgia Guoleella Notoscaphidia Orusia
Ecology: stationary epifaunal suspension feeder
Distribution:
• Whiterockian of United States (2: Alaska, Utah collections)
• Arenigian of United States (2: Nevada, Utah)
• Dawan of China (1)
• Arenig of China (9), the Russian Federation (4), the United Kingdom (1), United States (3: North Dakota, Oklahoma, Texas)
• Ordovician of Argentina (1), Canada (4: Alberta, Newfoundland and Labrador, Quebec), Ireland (1), Norway (1), the Russian Federation (9), United States (52: Alabama, Alaska, Georgia, Idaho, Missouri, Nevada, New York, Oklahoma, Pennsylvania, Tennessee, Texas, Utah, Vermont, Virginia)
• Canadian of Canada (4: Northwest Territories), United States (4: Maryland)
• Tremadoc of Argentina (1), Bolivia (2), China (5), the Russian Federation (10), United States (1: Texas)
• Skullrockian of Canada (7: Newfoundland, Newfoundland and Labrador)
• Cambrian to Ordovician of the Russian Federation (1)
• Cambrian of China (3), Norway (14), Poland (1), the Russian Federation (1), Sweden (1), United States (6: Missouri, Oklahoma, Vermont)
Total: 151 collections including 161 occurrences