WAmphiaspididae
WArandaspida
WArchipelepis
WAriaspidae
WAteleaspididae
WBirkeniidae
WBoreaspis
WCardipeltis
WCephalaspidae
WCoelolepidae
WCtenaspidae
WCyathaspididae
WFurcacaudidae
WGabreyaspididae
WHibernaspis
WLasanius
WMyllokunmingiidae
WOlbiaspididae
WPharyngolepis
WPhlebolepididae
WProtaspididae
WProtopteraspididae
WPsammosteidae
WPteraspididae
WPterygolepis
WRhyncholepisWArandaspida
WTolypelepidida
WTraquairaspidiformes
WWeigeltaspis
WZenaspididae