Helcionelloida - Helcionellida

Invalid subtaxa: Mellopegmidae Missarzhevsky 1989, Stenothecinae Runnegar and Jell 1980 [invalid subgroup]

Full reference: B. Runnegar and P.A. Jell. 1980. Australian Middle Cambrian molluscs: correction and additions. Alcheringa 4(1/2):111-113

Parent taxon: Yochelcionelloidea according to P. Bouchet et al. 2005

Sister taxa: Rugaeconidae, Trenellidae, Yochelcionellidae

Subtaxa: Acanthotheca, Anabarella, Eurekapegma, Mellopegma, Planutenia, Pseudoscenella, Stenotheca, Watsonellinae

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Ecology: stationary epifaunal suspension feeder