Parent taxon: Ozarkodinina according to P. C. J. Donoghue et al. 2008
See also Clark et al. 1981 and von Bitter and Austin 1984
Sister taxa: Bactrognathidae, Ozarkodina, Palmatolepidae, Scaliognathus, Yaoxianognathus
Subtaxa: Cavusgnathidae Clydagnathus Cryptotaxidae Dinodus Eognathodus Kockelellamecdup Lochriea Nicollidina Polygnathidae Vogelgnathus
Type: Polygnathidae
Ecology: nektonic carnivore
Distribution:
• Triassic of Greece (1 collection), Serbia and Montenegro (1)
• Permian of the Russian Federation (1)
• Carboniferous of Austria (6), Brazil (1), China (32), Germany (3), Greece (4), India (1), Iran (2), Ireland (3), Mexico (7), the Russian Federation (18), Spain (7), the United Kingdom (35), United States (76: Alabama, Arizona, Arkansas, California, Iowa, Kansas, Kentucky, Missouri, Montana, Nebraska, Nevada, Ohio, Oklahoma, Pennsylvania, Texas, Utah, Virginia, Wyoming)
• Devonian to Triassic of Greece (1)
• Devonian of Algeria (20), Australia (201), Austria (77), Belgium (35), Brazil (1), Bulgaria (17), Canada (95: Northwest Territories, Northwest Territories and Yukon, Nunavut, Ontario, Yukon, Yukon Territory), China (113), the Czech Republic (44), France (92), Germany (144), Greece (7), Iran (12), Italy (23), Mongolia (4), Morocco (247), Myanmar (2), Poland (88), Portugal (1), the Russian Federation (56), Spain (188), Tajikistan (5), Turkey (3), United States (240: Alaska, Arizona, California, Indiana, Iowa, Michigan, Minnesota, Nevada, New Mexico, New York, Ohio, Texas), Uzbekistan (12), Vietnam (5), Western Sahara (2)
• Silurian to Devonian of Australia (14), Italy (1)
• Silurian of Australia (11), Austria (4), Bulgaria (4), Canada (1: Yukon Territory), the Czech Republic (10), Italy (2), Lithuania (1), Morocco (1), the Russian Federation (1), Sweden (49), the United Kingdom (16), United States (16: Nevada, Ohio)
Total: 2064 collections including 5166 occurrences