†family Ranorthidae Havlicek 1949 (lamp shell)

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

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Ecology: stationary epifaunal suspension feeder

Distribution:

• Ordovician of Belarus (1 collection), Canada (1: Newfoundland), the Czech Republic (2), Estonia (24), Iran (2), Kazakhstan (8), Kyrgyzstan (2), Lithuania (1), Morocco (3), Norway (2), the Russian Federation (76), Spain (1)

• Klabava of the Czech Republic (2)

• Arenig of Canada (1: New Brunswick), France (1), Morocco (1)

Total: 128 collections including 129 occurrences

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