Pteraspidomorpha - Corvaspidiformes
Parent taxon: Heterostraci according to R. van der Laan 2019
Sister taxa: Amphiaspidiformes, Aporemaspis, Ariaspididae, Aserotaspis, Cardipeltida, Cardipeltidae, Cardipeltiformes, Ceraspidae, Corvaspidida, Cyathaspida, Cyathaspidiformes, Drepanaspidae, Guerichosteidae, Lepidaspidida, Lepidaspidiformes, Munchoaspis, Olbiaspidida, Palaeaspidi, Psammolepis, Psammosteiformes, Pteraspidi, Pteraspidiformes, Rimasventeraspis, Strosipherus, Tesseraspidida, Tesseraspidiformes, Tolypelepidida, Tolypelepidiformes, Toombsaspis, Traquairaspidida, Traquairaspidiformes, Clydonaspis, Homaspidella, Seretaspis, Karelosteus, Pilolepsis, Archodus, Poriferaspis, Grumantaspis, Obliaspis, Schizosteus, Listraspis, Irregulariaspis, Dyreaspis, Corveolepis, Pycnaspis, Yoglinia, Ennosviaspis, Allocryptaspis, Anatolepsis, Steinaspis, Strophisterus, Gunaspis, Kiangsuaspis
Subtaxa: Corvaspididae
Ecology: planktonic suspension feeder
Distribution:
• Devonian of Canada (5: Northwest Territories, Nunavut collections), Norway (10), the Russian Federation (2), Ukraine (2), the United Kingdom (1)
• Silurian of Canada (4: Nunavut), the United Kingdom (1)
Total: 25 collections including 27 occurrences