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, Obliaspis, Irregulariaspis, Kiangsuaspis, Pilolepsis, Clydonaspis, Seretaspis, Poriferaspis, Grumantaspis, Steinaspis, Homaspidella, Corveolepis, Dyreaspis, Pycnaspis, Yoglinia, Gunaspis, Karelosteus, Allocryptaspis, Ennosviaspis, Strophisterus, Archodus, Schizosteus, Listraspis
Subtaxa: Pycnosteidae
Ecology:
Distribution:
• Devonian of Belarus (1 collection), Estonia (7), Latvia (2), the Russian Federation (3)
Total: 13 collections including 17 occurrences