†family Cyclocoeliidae Schuchert and Cooper 1931 (lamp shell)
Rhynchonellata - Orthida - Cyclocoeliidae
Parent taxon: Plectorthoidea according to A. Williams et al. 2000
Sister taxa: Apatoskenidioides, Chilcorthidae, Cremnorthidae, Eoorthidae, Euorthisinidae, Finkelnburgiidae, Giraldiellidae, Lebediorthis, Nanorthidae, Phragmorthidae, Platystrophiidae, Plectorthidae, Ranorthidae, Rhactorthidae, Tasmanorthidae, Wangyuiidae
Subtaxa: Cyclocoelia Rhynchorthis
Type: Cyclocoelia
Ecology: stationary epifaunal suspension feeder
Distribution:
• Arenig of the United Kingdom (1 collection)
• Ordovician of Canada (1: Quebec), China (1)
Total: 3 collections each including a single occurrence