Pteraspidomorpha - Tesseraspidiformes
Parent taxon: Heterostraci according to R. van der Laan 2019
Sister taxa: Amphiaspidiformes, Aporemaspis, Ariaspididae, Aserotaspis, Cardipeltida, Cardipeltidae, Cardipeltiformes, Ceraspidae, Corvaspidida, Corvaspidiformes, Cyathaspida, Cyathaspidiformes, Drepanaspidae, Guerichosteidae, Lepidaspidida, Lepidaspidiformes, Munchoaspis, Olbiaspidida, Palaeaspidi, Psammolepis, Psammosteiformes, Pteraspidi, Pteraspidiformes, Rimasventeraspis, Strosipherus, Tesseraspidida, Tolypelepidida, Tolypelepidiformes, Toombsaspis, Traquairaspidida, Traquairaspidiformes, Poriferaspis, Pycnaspis, Archodus, Kiangsuaspis, Strophisterus, Clydonaspis, Ennosviaspis, Obliaspis, Anatolepsis, Dyreaspis, Corveolepis, Schizosteus, Homaspidella, Gunaspis, Grumantaspis, Allocryptaspis, Pilolepsis, Yoglinia, Irregulariaspis, Karelosteus, Steinaspis, Seretaspis, Listraspis
Subtaxa: Natlaspididae Tesseraspididae
Ecology: planktonic suspension feeder
Distribution:
• Devonian of Canada (1: Northwest Territories collection), Lithuania (1), the Russian Federation (1), Ukraine (1), the United Kingdom (2)
• Silurian of Lithuania (1), the United Kingdom (1)
Total: 8 collections including 9 occurrences