WAcanthohoplites
WAenigmatoceras
WAmphiaspidida
WAmphiaspididae
WAmphiaspidoidei
WAmphiaspis
WAmphoraspis
WAndiva
WAngarichthys
WAphaneramma
WArthrolycosa
WAsaphus
WAtrypa
WAxitectum
WBaculites
WBorchgrevinkium
WBrithopus
WCampodus
WCampylocephalus
WCephalonega
WChalishevia
WChroniosaurus
WChthonosaurus
WClamorosaurus
WCollidosuchus
WComposita
WCondylopyge
WCummingella
WCyathaspidiformes
WDelgadella
WDuctina
WDvinia
WDvinosaurus
WDvulikiaspis
WEastmanosteus
WEstemmenosuchus
WEstlandia
WFavosites
WGabreyaspididae
WGlossopteris
WGlyptolepis (fish)
WGobiconodon
WHalysites
WHibernaspidoidei
WHibernaspis
WHolonema
WHoplolichoides conicotuberculatus
WIllaenus
WInostrancevia
WIntasuchus
WKamacops
WKannemeyeria
WKileskus
WKonzhukovia
WKotlassia
WKubanochoerus
WKulindadromeus
WLatouchella
WLeptaena
WLonchodomas
WLossinia
WMawsonites
WMelosaurus
WMesenosaurus
WMicrourania
WMithridatocetus
WMucrospirifer
WOlbiaspididae
WOvatoscutum
WPagetia
WPalaeophragmodictya
WParahelicoprion
WPentagnostus
WPerplexisaurus
WPhalagnostus
WPhytophilaspis
WPlagioscutum
WPlanolites
WPlatyoposaurus
WPlatypterygius
WPlatystrophia
WPliomera
WPliosaurus
WPlutonides
WProcynosuchus
WPtychoceratodus
WPycnosteus
WRabidosaurus
WRafinesquina
WRhadiodromus
WSaarina
WSauroctonus
WScalopodontes
WScutosaurus
WSibirotitan
WSolza (animal)
WSuchogorgon
WSuchonica
WSuchonosaurus
WSuminia
WSwartpuntia
WSymmorium
WTchernyshevioides
WToragnostus
WTribrachidium
WTrimerocephalus
WTryphosuchus
WUralerpeton
WVendia
WVentogyrus
WViatkosuchus
WVolgatitan
WWetlugasaurus
WYorgia
WZygosaurus