Pteraspidomorpha - Psammosteiformes
Parent taxon: Heterostraci according to S. V. Moloshnikov 2009
Sister taxa: Amphiaspidiformes, Aporemaspis, Ariaspididae, Aserotaspis, Cardipeltida, Cardipeltidae, Cardipeltiformes, Ceraspidae, Corvaspidida, Corvaspidiformes, Cyathaspida, Cyathaspidiformes, Drepanaspidae, Guerichosteidae, Lepidaspidida, Lepidaspidiformes, Munchoaspis, Olbiaspidida, Palaeaspidi, Pteraspidi, Pteraspidiformes, Rimasventeraspis, Strosipherus, Tesseraspidida, Tesseraspidiformes, Tolypelepidida, Tolypelepidiformes, Toombsaspis, Traquairaspidida, Traquairaspidiformes, Ennosviaspis, Corveolepis, Seretaspis, Steinaspis, Pilolepsis, Dyreaspis, Schizosteus, Poriferaspis, Gunaspis, Kiangsuaspis, Irregulariaspis, Yoglinia, Listraspis, Clydonaspis, Obliaspis, Grumantaspis, Strophisterus, Karelosteus, Homaspidella, Anatolepsis, Archodus, Pycnaspis, Allocryptaspis
Subtaxa: Pycnosteidae
Ecology: planktonic suspension feeder
Distribution:
• Devonian of Belarus (1 collection), Estonia (7), Latvia (2), the Russian Federation (3)
Total: 13 collections including 17 occurrences