†unranked clade Poraspidei Kiaer 1932 (jawless fish)
as a "tribe" or rank above family
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: Cyathaspidei
Subtaxa: Ctenaspidae Dinaspidae Palaeaspidae
Ecology: planktonic suspension feeder
Distribution:
• Devonian of Canada (5: Nunavat, Nunavut collections), Norway (6), the Russian Federation (1), Ukraine (2), United States (1: Nevada)
• Silurian of United States (3: New York, Pennsylvania)
Total: 18 collections including 23 occurrences