WAmphidiscosida
WAphrocallistidae
WAspidoscopulia
WBrooksella alternata
WCaulophacus
WCaulophacus elegans
WChondrosiida
WCorbitella
WCribrospongiidae
WErnstia gracilis
WEthmophyllum
WEuplectella
WEuplectellidae
WEuretidae
WEuretinae
WFarrea
WFarrea occa
WFarreidae
WGemmule
WLanuginellinae
WLefroyella
WOsculum
WPlakinidae
WPlocoscyphia
WRossellidae
WScandia mutabilis
WSiliceous sponge
WStaurocalyptus
WTarpon Springs Sponge Boats MPS
WTretodictyidae
WUncinateridae