Rhynchonellata - Terebratulida - Angustothyrididae
Parent taxon: Dielasmatoidea according to A. Williams et al. 2006
Sister taxa: Adygellopsis, Antzeilleridae, Athyrorhynchia, Beecheriidae, Dielasmatidae, Gillediidae, Heterelasminidae, Juvavellidae, Paradygella, Proanadyrella, Pseudodielasmatidae, Pseudoharttina, Pseudopygoides, Thyratryaria, Zugmayeriidae, Aulacothyroideidae
Subtaxa: Angustothyris Caucasothyris Cubanothyris Cystothyris Paradoxothyris Praeangustothyris Praecubanothyris Rhaetina
Ecology: stationary low-level epifaunal suspension feeder
Distribution:
• Triassic of Austria (101 collections), Bosnia and Herzegovina (1), Bulgaria (2), Canada (1: British Columbia), China (60), Germany (3), Hungary (43), Iran (1), Italy (25), Poland (3), Romania (3), the Russian Federation (20), Slovakia (16), Switzerland (1), Tajikistan (4), Turkey (4), Ukraine (1), United States (10: California, Idaho, Nevada), Vietnam (1)
• Permian of the Russian Federation (7)
Total: 307 collections including 376 occurrences