Parent taxon: Agnostina according to R. Lerosey-Aubril et al. 2020
See also Bruton and Harper 2000, Palmer and Halley 1979, Pour and Popov 2009 and Westrop et al. 1996
Sister taxa: Agnostogonus, Armagnostus, Blystagnostus, Condylopygoidea, Delagnostus, Dignagnostus, Grandagnostus, Hastagnostus, Phoidagnostus, Quadragnostidae, Skryjagnostus
Subtaxa: Hypagnostoidae Peronopsidae
Ecology: nektonic suspension feeder
Distribution:
• Tremadoc of Argentina (9 collections)
• Solvan of Australia (2), Canada (23: Newfoundland and Labrador), the Czech Republic (4), Spain (1)
• Amgan of Kazakhstan (5), Kyrgyzstan (1), Norway (1), the Russian Federation (6), United States (2: Utah)
• Ordian of Australia (3)
• Delamaran of Canada (26: British Columbia), Mexico (1), Morocco (1), United States (12: California-Nevada, Idaho, Nevada, Nevada and California, Pennsylvania, Utah)
• Cambrian of Antarctica (1), Argentina (1), Australia (7), Canada (15: Alberta-British Columbia, Brithish Columbia, British Columbia, Newfoundland and Labrador, Northwest Territories, Quebec), China (20), the Czech Republic (9), Denmark (3), France (1), Greenland (11), India (2), Iran (1), Italy (1), Kazakhstan (25), Norway (2), Poland (1), the Russian Federation (4), Spain (5), Sweden (4), Turkey (4), the United Kingdom (5), United States (65: Alaska, Georgia, Idaho, Montana, Nevada, New York, Pennsylvania, South Carolina, Utah, Vermont)
Total: 284 collections including 383 occurrences