Helcionelloida - Helcionellida - Yochelcionellidae
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):109-138
Parent taxon: Yochelcionelloidea according to P. Bouchet et al. 2005
See also Missarzhevsky 1989, Parkhaev 2002, Parkhaev 2004, Runnegar and Jell 1976 and Wahlman 1992
Sister taxa: Rugaeconidae, Trenellidae
Subtaxa: Enigmaconus Eotebenna Janospira Yochelcionella
Ecology: slow-moving low-level epifaunal grazer
Distribution:
• Cambrian of Antarctica (4 collections), Australia (4), Canada (6: Newfoundland and Labrador, Northwest Territories, Quebec), China (3), Denmark (1), Germany (1), Greenland (12), Kazakhstan (1), Kyrgyzstan (2), New Zealand (1), the Russian Federation (14), Spain (1), the United Kingdom (1), United States (3: New York, Pennsylvania)
• Amgan of the Russian Federation (2)
• Solvan of Australia (1), the Russian Federation (4)
Total: 61 collections including 77 occurrences