Artiopoda - Agnostida - Spinagnostidae
Parent taxon: Spinagnostidae according to J. B. Jago and R. A. Cooper 2007
Sister taxa: Cotalagnostus, Doryagnostus, Eoagnostus, Pseudoperonopsis, Raragnostus, Peratagnostus, Tomagnostella
Subtaxa: Hypagnostus
Ecology: slow-moving epifaunal detritivore
Distribution:
• Cambrian of Antarctica (2 collections), Argentina (2), Australia (12), Canada (22: British Columbia, New Brunswick, Newfoundland and Labrador), China (94), the Czech Republic (2), Denmark (1), India (1), Kazakhstan (23), Mexico (1), Norway (3), the Russian Federation (2), Sweden (2), the United Kingdom (1), United States (11: Alaska, New York, South Carolina, Utah, Vermont)
• Solvan of the Czech Republic (1)
Total: 180 collections including 236 occurrences