Rhynchonellata - Terebratulida - Dielasmatidae
Parent taxon: Dielasmatoidea according to H. R. Feldman 2017
See also Brunton and Champion 1974, Chen and Shi 2006, Feldman 2002 and Williams et al. 2006
Sister taxa: Adygellopsis, Angustothyrididae, Antzeilleridae, Athyrorhynchia, Beecheriidae, Gillediidae, Heterelasminidae, Juvavellidae, Paradygella, Proanadyrella, Pseudodielasmatidae, Pseudoharttina, Pseudopygoides, Thyratryaria, Zugmayeriidae, Aulacothyroideidae
Subtaxa: Campbellelasma Centronelloideinae Dielasmatinae Grigorjevaelasma Gruntelasma Lengwuella Nucleatulinae Ustritskia
Ecology: stationary low-level epifaunal suspension feeder
Distribution:
• Triassic of Austria (12 collections), Bosnia and Herzegovina (7), Bulgaria (3), China (45), Colombia (1), East Timor (1), Egypt (1), Germany (17), Greenland (4), Hungary (70), India (6), Iran (2), Israel (6), Italy (9), Jordan (3), Kazakhstan (2), Nepal (1), New Caledonia (1), New Zealand (16), Papua New Guinea (3), Poland (11), Romania (4), the Russian Federation (26), Serbia and Montenegro (9), Slovakia (6), Spain (1), Tajikistan (1), Tunisia (4), United States (7: Alaska, California, Idaho, Montana), Vietnam (2), Yemen (6)
• Permian to Triassic of India (2)
• Permian of Afghanistan (4), Armenia (1), Australia (85), Austria (1), Bolivia (2), Cambodia (1), Canada (9: British Columbia, Nunavut, Yukon), Chile (2), China (96), Croatia (1), Germany (2), Greece (5), Greenland (7), India (7), Indonesia (3), Iran (10), Italy (1), Japan (7), Laos (2), Lithuania (10), Madagascar (1), Malaysia (3), Mexico (11), Myanmar (1), Nepal (6), New Zealand (17), Oman (13), Pakistan (116), Peru (7), Poland (5), the Russian Federation (66), Slovenia (2), Svalbard and Jan Mayen (2), Thailand (15), Turkey (5), the United Kingdom (43), United States (302: Alaska, California, Idaho, Kansas, Nevada, New Mexico, Oklahoma, Oregon, Texas, Utah, Wyoming)
• Carboniferous to Permian of United States (1: California)
• Carboniferous of Australia (17), Canada (6: Alberta, Yukon), China (3), India (1), Ireland (3), Svalbard and Jan Mayen (1), the United Kingdom (34), United States (151: Alaska, Arizona, Arkansas, California, Georgia, Idaho, Indiana, Iowa, Kansas, Kentucky, Missouri, Montana, Nevada, New Mexico, Oklahoma, Pennsylvania, Tennessee, Texas, Utah, Virginia)
• Devonian of China (3), Germany (1), United States (1: New Mexico)
Total: 1382 collections including 1805 occurrences