Pteraspidomorpha - Pteraspidiformes
Parent taxon: Heterostraci according to E. Randle and R. S. Sansom 2017
See also Blieck et al. 2002, Dumbrava and Blieck 2005, Elliott and Ilyes 1996, Long 2011 and Nelson et al. 2016
Sister taxa: Amphiaspidiformes, Aporemaspis, Ariaspididae, Cardipeltida, Cardipeltidae, Cardipeltiformes, Ceraspidae, Corvaspidida, Corvaspidiformes, Cyathaspida, Cyathaspididae, Cyathaspidiformes, Drepanaspidae, Lepidaspidida, Lepidaspidiformes, Olbiaspidida, Palaeaspidi, Protaspidae, Psammolepis, Psammosteiformes, Pteraspidi, Strosipherus, Tesseraspidida, Tesseraspidiformes, Thelodontidae, Tolypelepidida, Tolypelepidiformes, Traquairaspidida, Traquairaspidiformes
Subtaxa: Anchipteraspididae Protopteraspididae Pteraspididae Pteraspidoidei
Ecology: