†family Protorthidae Schuchert and Cooper 1931 (lamp shell)
Parent taxon: Protorthoidea according to A. Williams et al. 2000
Sister taxon: Leioriidae
Subtaxa: Glyptoria, Israelaria, Jamesella, Loperia, Protorthis, Psiloria, Saesorthis
Ecology: stationary low-level epifaunal suspension feeder