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, Psammolepis, Pteraspidi, Pteraspidiformes, Rimasventeraspis, Strosipherus, Tesseraspidida, Tesseraspidiformes, Tolypelepidida, Tolypelepidiformes, Toombsaspis, Traquairaspidida, Traquairaspidiformes, Anatolepsis, Corveolepis, Karelosteus, Listraspis, Gunaspis, Steinaspis, Grumantaspis, Pilolepsis, Clydonaspis, Pycnaspis, Allocryptaspis, Strophisterus, Archodus, Obliaspis, Poriferaspis, Homaspidella, Irregulariaspis, Ennosviaspis, Seretaspis, Kiangsuaspis, Dyreaspis, Yoglinia, Schizosteus
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