†suborder Cephalaspidoidei (vertebrate)
Osteostraci - Cephalaspidiformes
Parent taxon: Cephalaspidiformes according to R. van der Laan 2019
Sister taxa: Aachenaspis, Ateleaspidoidei, Fieldingaspis, Meelaidaspis, Ohesaareaspis, Scolenaspidoidei, Tuvaspis
Subtaxa: Cephalaspididae Parameteoraspididae Superciliaspididae
Ecology: planktonic suspension feeder
Distribution:
• Devonian of Canada (12: New Brunswick, Northwest Territories, Nova Scotia, Nunavut, Quebec collections), Latvia (1), Norway (8), Svalbard and Jan Mayen (3), Ukraine (4), the United Kingdom (15), United States (2: Wyoming)
• Silurian of Lithuania (1), the United Kingdom (1)
Total: 47 collections including 57 occurrences