†order Traquairaspidida Stensio 1958 (jawless fish)
Pteraspidomorpha - Traquairaspidida
Parent taxon: Heterostraci according to E. J. Loeffler and D. L. Dineley 1976
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, Thelodontidae, Tolypelepidida, Tolypelepidiformes, Toombsaspis, Traquairaspidiformes
Subtaxa: none
Ecology:
Distribution: found only at Pressure Point, Somerset Island [Peel Sound Fm] (Silurian of Nunavut)