Alternative spelling: Fenrstrata
Parent taxon: Palaeostomata according to M. Zhang et al. 2018
Sister taxa: Cryptostomida, Cystoporida, Esthonioporata, Trepostomida
Subtaxa: none
Distribution:
• Paleocene of United States (1: Texas collection)
• Leonard of United States (2: Montana, Wyoming)
• Permian of Australia (4), Canada (1: Nunavut), Greece (1), Iran (1), Oman (2), the Russian Federation (16), Tajikistan (2), Thailand (2), Tunisia (2), United States (50: Idaho, Kansas, Montana, Nevada, Texas, Utah, Wyoming), Venezuela (5)
• Virgilian of United States (7: Kansas, New Mexico, Texas)
• Desmoinesian of United States (2: Oklahoma, Texas)
• Atokan of United States (1: New Mexico)
• Pennsylvanian of Belize (2), United States (2: New Mexico)
• Chesterian of Canada (1: Alberta), United States (2: California, West Virginia)
• Osagean of United States (1: Indiana)
• Mississippian of United States (1: Alaska)
• Carboniferous of Antarctica (1), Canada (6: Alberta), France (1), Germany (1), Japan (1), the Russian Federation (1), Spain (4), the United Kingdom (2), United States (78: Alaska, Colorado, Indiana, Kansas, Kentucky, New Mexico, Oklahoma, Tennessee, Utah)
• Devonian of Canada (2: Northwest Territories), Germany (8), Morocco (6), Spain (9), United States (20: Montana, New York, West Virginia, Maryland, Pennsylvania), Western Sahara (1)
• Silurian of Belarus (1), Norway (7), Sweden (1), United States (4: New York, Wisconsin)
• Ordovician of Argentina (3), Canada (1: Quebec), Estonia (2), France (3), India (1), Italy (1), Norway (2), Sweden (2), the United Kingdom (1), United States (4: Kentucky, Ohio, Utah)
• Arenig of Ireland (1)
Total: 283 collections including 319 occurrences