†order Orthida Schuchert and Cooper 1932 (lamp shell)
Synonym: Rhipidomellida Schuchert 1913 [replaced name]
Parent taxon: Rhynchonellata according to A. Williams et al. 2000
Sister taxa: Athyridida, Atrypida, Cadomelloidea, Cardiarinidae, Dentatrypa, Mongolellidae, Pentamerida, Protorthida, Rhynchonellida, Spiriferida, Spiriferinida, Terebratulida, Thecideida, Tropidoleptidae
Subtaxa: Archaeorthidae, Dalmanellidina, Fehamya, Glypterina, Kundatella, Lesserorthis, Oleorthis, Orthidina, Sphenorthis, Virgoria
Ecology: stationary epifaunal suspension feeder