Pteraspidomorpha - Cyathaspidiformes - Cyathaspididae
Full reference: D. K. Elliott. 2016. The Boothiaspidinae, a new agnathan subfamily (Heterostraci, Cyathaspididae) from the late Silurian and Early Devonian of the western United States and the Canadian Arctic. Journal of Paleontology 90(6):1212-1224
Parent taxon: Cyathaspididae according to D. K. Elliott 2016
See also van der Laan 2019
Sister taxa: Alainaspis, Anglaspidinae, Archegonaspis, Cyathaspidinae, Cyathaspis, Dikenaspis, Eoarchegonaspis, Faberaspis, Homalaspidella, Irregulareaspidinae, Pionaspis, Poraspidinae, Ptomaspis, Sanidaspis, Tolypelepidinae, Vernonaspis
Subtaxa: Boothiaspis Phyllonaspis
Ecology:
Distribution:
• Devonian of Canada (4: Nunavut collections), United States (4: California, Nevada, Utah)
• Silurian of Canada (2: Nunavut)
Total: 10 collections including 13 occurrences