†subfamily Irregulareaspidinae Denison 1964 (jawless fish)
Pteraspidomorpha - Cyathaspidiformes - Cyathaspididae
Parent taxon: Cyathaspididae according to D. Dineley and W. Loeffler 1976
Sister taxa: Alainaspis, Anglaspidinae, Archegonaspis, Boothiaspidinae, Cyathaspidinae, Cyathaspis, Dikenaspis, Eoarchegonaspis, Faberaspis, Homalaspidella, Pionaspis, Poraspidinae, Ptomaspis, Sanidaspis, Tolypelepidinae, Vernonaspis
Subtaxa: Dinaspidella Irregulareaspis Nahanniaspis
Type: Irregulareaspis
Ecology: planktonic suspension feeder
Distribution:
• Devonian of Canada (2: Northwest Territories collections), Norway (5), the Russian Federation (1), Svalbard and Jan Mayen (1), Ukraine (1)
Total: 10 collections including 14 occurrences