†family Productorthidae Schuchert and Cooper 1931 (lamp shell)
Parent taxon: Orthoidea according to A. Williams et al. 2000
Sister taxa: Anomalorthidae, Bohemiellidae, Glyptorthidae, Hesperonomiidae, Hesperorthidae, Lycophoriidae, Orthidae, Orthidiellidae, Plaesiomyidae, Poramborthidae, Tarfayidae, Whittardiidae, Dolerorthidae
Subtaxa: Glossorthinae, Productorthinae
Ecology: stationary epifaunal suspension feeder