†family Pachycardiidae Cox 1961 (clam)
Bivalvia - Unionida - Pachycardiidae
Parent taxon: Unionacea according to N. D. Newell 1965
See also Hayami 1975 and Nevesskaja 2009
Sister taxa: Actinodontophoridae, Margaritiferidae, Mutelidae, Sancticarolitidae, Unionidae
Subtaxa: Cardinioides Guangdongella Pachycardia Weixiella Weiyuanella Yunnanophorus Zhifangia
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Jurassic of Argentina (3 collections), Germany (1), Japan (2)
• Triassic of Bosnia and Herzegovina (1), China (6), Hungary (1), Iran (4), Italy (23), Japan (2), Mexico (1), the Russian Federation (11), Slovenia (3), United States (5: Nevada, Oregon)
• Permian of Tunisia (1)
Total: 64 collections including 79 occurrences