WAcanthopyge
WAcaste (trilobite)
WAsaphida
WBirmanites
WCheiruridae
WCheirurina
WCheirurus
WCnemidopyge
WColpocoryphe
WCoronocephalus
WCorynexochida
WCrotalocephalus
WCyphaspis
WDalmanites
WDiacalymene
WDipleura
WEncrinuridae
WEncrinurus
WFlexicalymene
WGlyptambon
WGravicalymene
WLeonaspis
WLichida
WMackenziurus
WMetacalymene
WOdontopleura
WParalejurus
WPlaniscutellum
WProetidae
WRaphiophoridae
WSphaerexochus