†order Helcionellida Geyer 1994 (mollusk)
Helcionelloida - Helcionellida
Full reference: G. Geyer. 1994. Middle Cambrian mollusks from Idaho and early conchiferan evolution. New York State Museum Bulletin 481(1):69-86
Parent taxon: Helcionelloida according to P. J. Wagner 2023
See also Bouchet et al. 2017, Geyer 1994, Jacquet and Brock 2016, Jacquet et al. 2016, Kouchinsky et al. 2017, Noriega-Ruiz et al. 2023 and Wotte 2006
Sister taxa: Beshtashella, Ceratoconidae, Emargimantus, Helcionelliformes, Michniakia, Pelagiellida
Subtaxa: Coreospiridae Helcionelloidea Tribelopoma Yochelcionelloidea
Ecology: slow-moving low-level epifaunal detritivore