Helcionelloida

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 T. Wotte 2006

Sister taxa: Beshtashella, Ceratoconidae, Emargimantus, Helcionelliformes, Michniakia, Pelagiellida, Rostroconus

Subtaxa: Coreospiridae, Helcionelloidea, Yochelcionelloidea

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Ecology: slow-moving low-level epifaunal detritivore