Pteraspidomorpha - Thelodontidae
Parent taxon: Heterostraci according to D. S. Jordan 1963
Sister taxa: Amphiaspidiformes, Aporemaspis, Ariaspididae, Cardipeltida, Cardipeltidae, Cardipeltiformes, Ceraspidae, Corvaspidida, Corvaspidiformes, Cyathaspida, Cyathaspidiformes, Drepanaspidae, Guerichosteidae, Lepidaspidida, Lepidaspidiformes, Munchoaspis, Olbiaspidida, Palaeaspidi, Protaspidae, Psammolepis, Psammosteiformes, Pteraspidi, Pteraspidiformes, Rimasventeraspis, Strosipherus, Tesseraspidida, Tesseraspidiformes, Tolypelepidida, Tolypelepidiformes, Toombsaspis, Traquairaspidida, Traquairaspidiformes
Subtaxa: Coelolepis Dasylepis Dictyolepis Gomphodus Lanarkia Melittomalepis Pachylepis Prionacanthus Schediosteus Spirodus Thelolepis
Ecology:
Distribution:
• Cretaceous of the Czech Republic (2 collections)
• Devonian of Ukraine (1), the United Kingdom (1)
• Silurian of Canada (1: Northwest Territories), Estonia (6), Lithuania (1), Sweden (1), the United Kingdom (5)
Total: 18 collections including 29 occurrences