†order Pentamerida Schuchert and Cooper 1931 (lamp shell)
Parent taxon: Rhynchonellata according to A. Williams et al. 2002
Sister taxa: Athyridida, Atrypida, Cadomelloidea, Cardiarinidae, Dentatrypa, Mongolellidae, Orthida, Protorthida, Rhynchonellida, Spiriferida, Spiriferinida, Terebratulida, Thecideida, Tropidoleptidae
Subtaxa: Pentameridina, Shordolella, Syntrophiidina
Ecology: stationary epifaunal suspension feeder