Artiopoda - Agnostida - Ptychagnostidae
Parent taxon: Condylopygoidea according to E. B. Naimark and T. V. Pegel 2017
See also Hong et al. 2003, Westrop et al. 1996 and Whittington et al. 1997
Sister taxa: Agnostidae, Ammagnostidae, Clavagnostidae, Condylopygidae, Diplagnostidae, Doryagnostidae, Glaberagnostus, Glyptagnostus, Leiagnostus, Megagnostus, Metagnostidae, Phalacromidae, Phalagnostus, Phaldagnostus, Pseudagnostidae, Spinagnostidae, Valenagnostus
Subtaxa: Acidusus Allobodochus Aotagnostus Goniagnostus Lejopyge Myrmecomimus Onymagnostus Pseudophalacroma Ptychagnostus Tomagnostus Triplagnostus Yakutiana
Ecology: slow-moving epifaunal detritivore
Distribution:
• Amgan of Kazakhstan (5 collections), the Russian Federation (1), United States (2: Utah)
• Solvan of Canada (9: Newfoundland and Labrador), the Czech Republic (1)
• Delamaran of United States (1: Utah)
• Cambrian of Antarctica (2), Argentina (4), Australia (32), Canada (19: British Columbia, New Brunswick, Newfoundland and Labrador), China (140), the Czech Republic (2), Denmark (2), Greenland (10), India (3), Italy (1), Kazakhstan (44), Mexico (1), North Korea (1), Norway (7), Poland (1), the Russian Federation (7), Sweden (2), the United Kingdom (5), United States (47: Alaska, Montana, Nevada, New York, South Carolina, Utah, Vermont)
Total: 349 collections including 707 occurrences