†superfamily Cycloconchacea Ulrich 1884 (clam)
Parent taxon: Modiomorphoida according to H. E. Vokes 1980
Sister taxa: Brahcylyrodesma, Junjagiana, Modiomorphoidea, Rimmyjmima
Subtaxa: Carydiidae Lamellodontidae
Ecology: stationary semi-infaunal suspension feeder
Distribution:
• Carboniferous of United States (1: California collection)
• Devonian of Canada (1: New Brunswick), Germany (3), Luxembourg (2), Poland (1), the United Kingdom (2), United States (47: New York, Pennsylvania)
• Silurian of Bolivia (1)
Total: 58 collections including 59 occurrences