WAcentrella
WAcerpenna
WAtalophlebia
WBaetis
WCaenis (mayfly)
WCallibaetis
WCentroptilum
WCloeon
WEcdyonurus
WElectrogena
WEpeorus
WEphemera (mayfly)
WEphemerella
WHabrophlebia
WHeptagenia
WHeterocloeon
WHexagenia
WLabiobaetis
WLeptophlebia
WLeucrocuta
WParaleptophlebia
WPentagenia
WRhithrogena
WStenacron
WStenonema