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):109-138
Parent taxon: Helcionellida according to P. J. Wagner 2023
See also Bouchet et al. 2005, Parkhaev 2002 and Parkhaev and Demidenko 2010
Sister taxa: Coreospiridae, Helcionellidae, Helcionelloidea, Stenothecidae, Tribelopoma, Yochelcionellidae
Subtaxa: Rugaeconidae Trenellidae
Type: Yochelcionellidae
Ecology: slow-moving low-level epifaunal grazer
Distribution:
• Cambrian of Antarctica (1 collection), Australia (25), Canada (1: Northwest Territories), China (16), France (2), Greenland (5), Mexico (2), the Russian Federation (23), United States (1: Massachusetts)
Total: 76 collections including 91 occurrences