WAlethopteris
WAmynilyspes
WAnnularia
WArchaeothyris
WAsaphestera
WAtrypa
WCalamites
WCalymene
WCephalaspis
WChancelloria
WChonetes
WClimatius
WCochleosaurus
WComposita
WCordaites
WCornulites
WCyclopteris
WDadoxylon
WDalmanites
WDendrerpeton
WEchinerpeton
WFordilla
WHalkieriid
WHolopea
WHomalonotus
WHylonomus
WHyolitha
WLatouchella
WLeptaena
WLingula (brachiopod)
WMeristella
WMicrodictyon
WMicromitra
WNeuropteris
WNoeggerathia
WNucula
WPaleothyris
WPecopteris
WPelagiellidae
WPlatyceras
WProtopteraspis
WSerrodiscus
WSigillaria
WSphenophyllum
WSphenopteris
WStigmaria
WTentaculites
WTorellella
WWalchia
WXyloiulus