†order Psammosteiformes Berg 1937 (jawless fish)
Pteraspidomorpha - Psammosteiformes
Parent taxon: Heterostraci according to S. V. Moloshnikov 2009
Sister taxa: Amphiaspidiformes, Aporemaspis, Ariaspididae, Cardipeltida, Cardipeltidae, Cardipeltiformes, Ceraspidae, Corvaspidida, Corvaspidiformes, Cyathaspida, Cyathaspididae, Cyathaspidiformes, Drepanaspidae, Lepidaspidida, Lepidaspidiformes, Olbiaspidida, Palaeaspidi, Protaspidae, Psammolepis, Pteraspidi, Pteraspidiformes, Strosipherus, Tesseraspidida, Tesseraspidiformes, Thelodontidae, Tolypelepidida, Tolypelepidiformes, Traquairaspidida, Traquairaspidiformes
Subtaxa: Pycnosteidae
Ecology:
Distribution:
• Devonian of Belarus (1 collection), Estonia (4), Latvia (2), the Russian Federation (3)
Total: 10 collections including 13 occurrences