Bivalvia - Cardiida - Vesicomyidae
Alternative spelling: Calyptogena
Synonyms: Ectenagena Woodring 1938, Phraegena Woodring 1938, Phreagena Woodring 1938
Parent taxon: Vesicomya according to E. V. Coan et al. 2000
See also Kiel and Amano 2010, Sepkoski 2002, Squires and Goedert 1991 and Woodring 1938
Sister taxa: Vesicomya (Vesicomya), Vesicomya (Waisiuconcha), Vesicomya ramondi
Subtaxa: Calyptogena (Calyptogena) Calyptogena katallaensis Vesicomya (Calyptogena) pacifica
Distribution:
• Quaternary of United States (1: California collection)
• Pliocene of United States (1: California)
• Miocene of Japan (2)
• Oligocene of the Russian Federation (1), United States (11: Alaska, Washington)
• Eocene of United States (6: Washington)
• Cretaceous of Japan (1)
Total: 23 collections including 24 occurrences