Parent taxon: Ptychopariina according to F. A. Sundberg and L.B. McCollum 2003
See also Landing et al. 2008, Pour and Popov 2009 and Sundberg and McCollum 2000
Sister taxa: Conocoryphacea, Guizhoucephalina, Huaiaspis, Leiostegiacea, Luaspididae, Paraantagmus, Ptychoparioidea, Tonopahella, Yuknessaspis
Subtaxa: Eokochaspis Hadrocephalites Kochina Mexicella
Ecology: fast-moving low-level epifaunal deposit feeder
Distribution:
• Solvan of Canada (6: British Columbia collections), United States (75: Nevada)
• Delamaran of Canada (7: Alberta, British Columbia), Mexico (1), United States (48: California, Montana, Nevada, Nevada and California, Utah)
• Cambrian of Argentina (1), Canada (2: British Columbia, Newfoundland), United States (38: Arizona, Idaho, Nevada, Utah, Vermont)
Total: 178 collections including 203 occurrences