†order Atrypida Rzhonsnitskaya 1960 (lamp shell)
Parent taxon: Rhynchonellata according to A. Williams et al. 2002
See also Jin and Chatterton 1997 and Sepkoski 2002
Sister taxa: Athyridida, Cadomelloidea, Cardiarinidae, Dentatrypa, Mongolellidae, Orthida, Pentamerida, Protorthida, Rhynchonellida, Spiriferida, Spiriferinida, Terebratulida, Thecideida, Tropidoleptidae
Subtaxa: Anazygidina Antelocoelia Atrypidina Davidsoniidina Lissatrypidina Protatrypinae Undithyrella Wutubulakia
Ecology: stationary epifaunal suspension feeder