†subfamily Triangopinae Mancenido 1993 (lamp shell)
Rhynchonellata - Terebratulida - Pygopidae
Parent taxon: Pygopidae according to A. Williams et al. 2006
Sister taxa: Dyscoliope, Glossothyris, Pygopinae, Sphenope
Subtaxa: Securithyris Triangope
Type: Triangope
Ecology: stationary low-level epifaunal suspension feeder
Distribution: