†order Tesseraspidiformes (jawless fish)
Pteraspidomorpha - Tesseraspidiformes
Parent taxon: Heterostraci according to R. Van Der Laan 2019
Sister taxa: Amphiaspidiformes, Aporemaspis, Ariaspididae, Cardipeltida, Cardipeltidae, Cardipeltiformes, Ceraspidae, Corvaspidida, Corvaspidiformes, Cyathaspida, Cyathaspididae, Cyathaspidiformes, Drepanaspidae, Lepidaspidida, Lepidaspidiformes, Olbiaspidida, Palaeaspidi, Protaspidae, Psammolepis, Psammosteiformes, Pteraspidi, Pteraspidiformes, Strosipherus, Tesseraspidida, Thelodontidae, Tolypelepidida, Tolypelepidiformes, Traquairaspidida, Traquairaspidiformes
Subtaxa: Natlaspididae Tesseraspididae
Ecology:
Distribution: found only at October Revolution Island [Severnaya Zemlya Fm] (Devonian of Russian Federation)