WAdelophthalmidae
WAnnuliconchus
WAnticalyptraea
WCeratiocaris
WChaetosalpinx
WConchicolites
WCoralloconchus
WDawsonoceratidae
WDibasterium
WEurypteridae
WEurypteroidea
WHughmilleriidae
WMixopteridae
WMonograptus
WMoselopteridae
WOffacolus
WOocerina
WPalaeoconchus
WParalogania
WParaphragmitidae
WPentamerus
WPterygotidae
WSeptalites
WSlimonidae
WStrobilopteridae
WStromatoporoidea