†unranked clade Cyathaspidei Kiaer 1932 (jawless fish)
Pteraspidomorpha - Cyathaspidei
as a "tribe" above family rank
Full reference: J. Kiaer. 1932. The Downtonian and Devonian vertebrates of Spitsbergen. IV, Suborder Cyathaspida. Skrifter Om Svalbard Og Ishavet 52:1-26
Parent taxon: Cyathaspida according to J. Kiaer 1932
Sister taxon: Poraspidei
Subtaxa: Diplaspidae Tolypaspidae Traquairaspidae
Type: Cyathaspis
Ecology: planktonic suspension feeder
Distribution:
• Devonian of Canada (11: Northwest Territories, Nova Scotia, Nunavut collections), Norway (6), Ukraine (1)
• Silurian to Devonian of Canada (1: Northwest Territories)
• Silurian of Canada (6: Northwest Territories, Nunavut), the United Kingdom (1)
Total: 26 collections including 33 occurrences