Pteraspidomorpha - Guerichosteidae
Full reference: L. Halstead Tarlo. 1964. Psammosteiformes (Agnatha). A review with descriptions of new material from the Lower Devonian of Poland. 179
Parent taxon: Heterostraci according to L. Halstead Tarlo 1964
Sister taxa: Amphiaspidiformes, Aporemaspis, Ariaspididae, Cardipeltida, Cardipeltidae, Cardipeltiformes, Ceraspidae, Corvaspidida, Corvaspidiformes, Cyathaspida, Cyathaspidiformes, Drepanaspidae, Lepidaspidida, Lepidaspidiformes, Munchoaspis, Olbiaspidida, Palaeaspidi, Protaspidae, Psammolepis, Psammosteiformes, Pteraspidi, Pteraspidiformes, Rimasventeraspis, Strosipherus, Tesseraspidida, Tesseraspidiformes, Thelodontidae, Tolypelepidida, Tolypelepidiformes, Toombsaspis, Traquairaspidida, Traquairaspidiformes
Subtaxa: Guerichosteus Hariosteus
Ecology:
Distribution: