Pteraspidomorpha - Tolypelepidiformes
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, Tesseraspidiformes, Thelodontidae, Tolypelepidida, Traquairaspidida, Traquairaspidiformes
Subtaxa: Tolypelepididae
Ecology:
Distribution:
• Silurian of Canada (1: Northwest Territories collection), Estonia (3), the Russian Federation (1)
Total: 5 collections each including a single occurrence