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:
• Volkhov of Belarus (1 collection), Estonia (10), Lithuania (3), the Russian Federation (47)
• Langevoja of the Russian Federation (1)
• Valaste of Estonia (2)
• Vaana of Estonia (1)
• Klabava of the Czech Republic (2)
• Arenig of Canada (1: New Brunswick), France (1), Morocco (1)
• Ordovician of Canada (1: Newfoundland), the Czech Republic (2), Estonia (11), Kazakhstan (8), Kyrgyzstan (2), Lithuania (1), Morocco (2), Norway (2), the Russian Federation (28), Spain (1)
• Tremadoc of Iran (2), Morocco (1)
Total: 131 collections including 132 occurrences