†order Rhombifera Zittel 1879
Parent taxon: Blastozoa according to M. A. Zuykov et al. 2008
See also Beaver et al. 1967, Regnéll 1945, Sepkoski 2002 and Zamora et al. 2017
Sister taxa: Asteroblastida, Blastoidea, Crinoidea, Diploporita, Eocrinoidea, Glyptosphaeritida, Lepidocystoidea, Parablastoidea, Paracrinoidea, Rhombifera, Soluta, Sphaeronitida
Subtaxa: Acantholepis Caryocystitida Caryocystitidacea Dibrachicystidae Dichoporita Glyptocystitida Glyptocystitidacea Glyptocystitoida Hillocystida Pirocystella Pleurocystitida Polycosmitida Thomacystis
Ecology: stationary intermediate-level epifaunal suspension feeder