†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 Y. Oh et al. 2025
See also Bouchet et al. 2017, Ebbestad et al. 2024, Geyer 1994, Jacquet and Brock 2016, Jacquet et al. 2016, Kouchinsky et al. 2017, Noriega-Ruiz et al. 2023, Wagner 2023 and Wotte 2006
Sister taxa: Beshtashella, Ceratoconidae, Emargimantus, Helcionelliformes, Michniakia, Pelagiellida
Subtaxa: Coreospiridae Helcionellidae Helcionelloidea Stenothecidae Tribelopoma Yochelcionellidae Yochelcionelloidea
Ecology: slow-moving low-level epifaunal detritivore