Parent taxon: Prioniodontida according to P. C. J. Donoghue et al. 2008
Sister taxa: Acodontidae, Anticostiodus, Balognathidae, Balognathoidea, Cyrtoniodontidae, Distomodontidae, Histiodella, Multioistodontidae, Oepikodus, Oistodontidae, Paracordylodontidae, Paracordylodus, Periodontidae, Phragmodus, Plectodinidae, Prioniodinida, Prioniodontacea, Rhipidognathidae, Strachanognathidae
Subtaxa: Apatognathus Aphelognathus Chirognathus Erika Erismodus Erraticodon Hibbardella Kladognathus Oulodus
Ecology: nektonic carnivore
Distribution:
• Triassic of Bosnia and Herzegovina (3 collections), Greece (17), Hungary (3), Israel (1), New Zealand (1), Serbia (1), United States (1: Nevada)
• Namurian of Malaysia (4)
• Carboniferous of Germany (1), India (1), Mexico (3), the Russian Federation (4), the United Kingdom (13), United States (29: California, Colorado, Illinois, Iowa, Kentucky, Missouri, Ohio, Oklahoma, Pennsylvania, Utah, Virginia, West Virginia, Wyoming)
• Devonian to Triassic of Greece (1)
• Devonian of Australia (39), Austria (36), Belgium (1), Bulgaria (5), Canada (2: Ontario, Yukon), China (9), Czechia (6), Greece (1), Italy (21), Morocco (4), Myanmar (1), Portugal (1), the Russian Federation (2), United States (49: California, Colorado, Iowa, Nebraska, Nevada, Texas, Utah), Vietnam (1), Western Sahara (2)
• Niagaran of Canada (1: Québec)
• Silurian to Devonian of Australia (7), Italy (1)
• Silurian of Australia (3), Austria (10), Bulgaria (3), Canada (89: British Columbia, Cornwallis Island, Manitoba, Nunavut, Ontario, Quebec, Québec, Yukon, Yukon Territory), Czechia (4), Estonia (106), Greece (3), Greenland (20), Italy (21), Latvia (3), Lithuania (22), Malaysia (1), Morocco (3), Norway (4), Poland (12), the Russian Federation (18), Sweden (198), Ukraine (9), the United Kingdom (30), United States (120: California, Indiana, Iowa, Kentucky, Missouri, New York, Ohio, Oklahoma, Wisconsin), Western Sahara (5)
• Whiterockian of Canada (4: British Columbia, Northwest Territories), United States (5: Nevada)
• Arenigian of United States (1: Alaska)
• Arenig of Argentina (3), China (3)
• Dawan of China (1)
• Ordovician to Devonian of Canada (5: Nunavut)
• Ordovician to Silurian of Canada (6: Nunavut, Québec)
• Ordovician of Argentina (19), Australia (4), Canada (61: British Columbia, Manitoba, Newfoundland, Northwest Territories, Ontario, Québec), China (34), Greenland (14), Iran (1), Ireland (1), Kazakhstan (1), Malaysia (1), Mongolia (2), New Zealand (1), Peru (1), the Russian Federation (37), Spain (1), Svalbard and Jan Mayen (1), United States (24: Alaska, Colorado, Iowa, Minnesota, Missouri, Nevada, Oklahoma, Wyoming)
Total: 1187 collections including 1702 occurrences