†family Cremnorthidae Williams 1963 (lamp shell)

Rhynchonellata - Orthida - Cremnorthidae

Parent taxon: Plectorthoidea according to A. Williams et al. 2000

See also Mitchell 1977 and Potter 1990

Sister taxa: Apatoskenidioides, Chilcorthidae, Cyclocoeliidae, Eoorthidae, Euorthisinidae, Finkelnburgiidae, Giraldiellidae, Lebediorthis, Nanorthidae, Phragmorthidae, Platystrophiidae, Plectorthidae, Ranorthidae, Rhactorthidae, Tasmanorthidae, Wangyuiidae

Subtaxa: Brandysia Cremnorthinae Cremnorthis Septorthis

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Ecology: stationary epifaunal suspension feeder

Distribution:

• Uhaku of Belarus (1 collection), Lithuania (1)

• Dobrotivian of the Czech Republic (1)

• Ordovician of Belarus (1), Estonia (14), Ireland (4), Latvia (1), Lithuania (5), Norway (4), Spain (1), the United Kingdom (11)

Total: 44 collections each including a single occurrence

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