Helcionelloida - Helcionellida

Full reference: B. Runnegar and P.A. Jell. 1976. Australian Middle Cambrian molluscs and their bearing on early molluscan evolution. Alcheringa 1(1/2):109-132

Parent taxon: Helcionellida according to P. J. Wagner 2011

Sister taxa: Coreospiridae, Helcionelloidea

Subtaxa: Rugaeconidae, Stenothecidae, Trenellidae, Yochelcionellidae

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Type: Yochelcionellidae

Ecology: slow-moving low-level epifaunal grazer