†family Cyclacanthariidae Cooper and Grant 1975 (lamp shell)
Full reference: G. A. Cooper and R. E. Grant. 1975. Permian Brachiopods of West Texas, III. Smithsonian Contributions to Paleobiology 19:795-1921
Parent taxon: Richthofenioidea according to A. Williams et al. 2000
Sister taxa: Gemmellaroiidae, Hercosiidae, Richthofeniidae
Subtaxa: Cyclacanthariinae, Teguliferininae
Ecology: stationary low-level epifaunal suspension feeder