Alternative spelling: Clydonitacea
Parent taxon: Ceratitina according to V. Pieroni and M. Balini 2026
See also Zeiss 1977
Sister taxa: Acrochordiceratidae, Celtitidae, Ceratitoidea, Danubitoidea, Meekoceratidae, Paranannitidae, Ussuriidae
Subtaxa: Trachyceratidae
Ecology: nektonic carnivore
Distribution:
• Triassic of Afghanistan (2 collections), Austria (7), Bosnia and Herzegovina (2), Canada (191: Alberta, British Columbia, Northwest Territories, Nunavut, Yukon), China (26), Croatia (1), Germany (3), Greece (3), Hungary (12), India (7), Indonesia (13), Israel (3), Italy (236), Japan (5), Malaysia (4), Mexico (3), Nepal (3), Papua New Guinea (1), Peru (1), Romania (2), the Russian Federation (51), Serbia (1), Slovenia (6), Spain (25), Svalbard and Jan Mayen (9), Switzerland (1), Thailand (4), Türkiye (17), Ukraine (2), United States (55: Alaska, California, Nevada, Oregon), Vietnam (1)
Total: 697 collections including 1319 occurrences