Helcionelloida - Helcionellida

Synonym: Enigmaconidae MacKinnon 1985

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: Yochelcionelloidea according to P. Bouchet et al. 2005

Sister taxa: Rugaeconidae, Stenothecidae, Trenellidae

Subtaxa: Enigmaconus, Eotebenna, Janospira, Jinonicella, Yochelcionella

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Ecology: slow-moving low-level epifaunal grazer