Rhynchonellata - Orthida - Ranorthidae
Parent taxon: Plectorthoidea according to A. Williams et al. 2000
See also Popov et al. 2009 and Rubel 1961
Sister taxa: Apatoskenidioides, Chilcorthidae, Cremnorthidae, Cyclocoeliidae, Eoorthidae, Euorthisinidae, Finkelnburgiidae, Giraldiellidae, Lebediorthis, Nanorthidae, Phragmorthidae, Platystrophiidae, Plectorthidae, Rhactorthidae, Tasmanorthidae, Wangyuiidae
Subtaxa: Eodalmanella Ranorthis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Langevoja of the Russian Federation (1 collection)
• Valaste of Estonia (2)
• Vaana of Estonia (1)
• Billingen of Estonia (10), the Russian Federation (11)
• Klabava of the Czech Republic (2)
• Arenig of Canada (1: New Brunswick), France (1), Morocco (1)
• Ordovician of Belarus (1), Canada (1: Newfoundland), the Czech Republic (1), Estonia (11), Iran (2), Kazakhstan (8), Kyrgyzstan (2), Lithuania (4), Morocco (3), Norway (2), the Russian Federation (68), Spain (1)
• Cambrian to Ordovician of the Russian Federation (1)
Total: 135 collections including 136 occurrences