Hexactinellida - Hexactinosa - Euryplegmatidae
Parent taxon: Hexactinosa according to R.E.H. Reid 2004
Sister taxa: Aphrocallistidae, Aulocalycidae, Auloplacidae, Caesaria, Carinthiaspongus, Caseispongia, Clavularia, Cribrospongiidae, Cystispongiidae, Emplocidae, Euretidae, Farreidae, Furcicanalis, Idiodictyon, Imbricareola, Laocaetis, Misonia, Multiloqua, Mysterium, Octobrum, Pileolitoidea, Pillaraspongioidea, Polysyge, Porospongia, Rhogostomium, Rhombedonium, Scopularia, Scotospongia, Staurodermatidae, Tesselispongia, Tremaphorus, Tretodictyidae, Vermifistula, Xenoschrammenus
Subtaxa: Euryplegma
Type: Euryplegma
Ecology: stationary epifaunal suspension feeder
Distribution: found only at CH/f63a Tutuiri Stream, Chatham Island (Paleocene to Eocene of New Zealand)