Full reference: P. A. Jell, C. F. Burrett, and M. R. Banks. 1985. Cambrian and Ordovician echinoderms from eastern Australia. Alcheringa 9(3):183-208
Parent taxon: Eocrinoidea according to P. A. Jell et al. 1985
Sister taxa: Acanthocystites, Ascocystitida, Ascocystitidae, Balangicystis, Balantiocystis, Bolboporites, Cardiocystites, Cigara, Cryptocrinitidae, Cymbionites, Gogiida, Haimacystis, Hexedriocystis, Imbricata, Lapillocystites, Lichenoididae, Lingulocystidae, Llanocystis, Luhocrinus, Marjumicystis, Palaeocystitidae, Paracryptocrinites, Peridionites, Pilocystites, Polyptychella, Rhipidocystidae, Trachelocrinida, Ubaghsicystis
Subtaxa: Ridersia
Type: Ridersia
Ecology: stationary epifaunal suspension feeder
Distribution: found only at NMVPL1597, Chatsworth homestead (Cambrian of Australia)