Helcionelloida - Helcionellida - Stenothecidae
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: Stenothecidae according to Y. Oh et al. 2025
See also Bouchet et al. 2005, Landing et al. 2002, Missarzhevsky 1989, Parkhaev 2002, Parkhaev 2004, Runnegar and Jell 1976, Runnegar and Jell 1980, Sepkoski 2002 and Vendrasco et al. 2011
Sister taxa: Acanthotheca, Eurekapegma, Planutenia, Pseudoscenella, Stenotheca, Stenothecinae, Watsonella, Watsonellinae
Subtaxa: Mellopegma georginense Mellopegma indecora Mellopegma schizocheras Mellopegma simesi Mellopegma uslonica
Type: Mellopegma georginensis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Cambrian of Australia (6 collections), Canada (2: British Columbia, Quebec), China (1), Greenland (4), New Zealand (1), the Russian Federation (11), the United Kingdom (2), United States (3: New York, Utah)
• Templetonian of Australia (1)
• Placentian of United States (2: Massachusetts)
Total: 33 collections including 36 occurrences
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.