Bivalvia - Thraciida - Periplomatidae
Parent taxon: Periploma according to A. I. Kafanov et al. 2005
See also Tashiro and Kozai 1982
Sister taxa: Periploma (Aelga), Periploma (Offadesma), Periploma acuta, Periploma ariei, Periploma binominata, Periploma caribana, Periploma claibornense, Periploma clarki, Periploma collardi, Periploma cryphia, Periploma discus, Periploma eodiscus, Periploma iesakai, Periploma inaequivalve, Periploma japonica, Periploma johnseni, Periploma margaritacea, Periploma margaritaceum, Periploma ovatum, Periploma peralta, Periploma santaecrucis, Periploma stewartvillensis, Periploma subgracile, Periploma venezuelana
Subtaxa: Periploma (Periploma) mifunensis Periploma (Periploma) planiuscula Periploma (Periploma) pulchella
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Quaternary of United States (10: California collections)
• Pliocene of Costa Rica (3), Ecuador (1), United States (3: California)
• Miocene of the Russian Federation (5), United States (3: Alaska)
• Oligocene of the Russian Federation (2)
• Eocene of Japan (1), the Russian Federation (2)
• Paleocene of the Russian Federation (1)
• Cretaceous of Japan (1)
Total: 32 collections including 33 occurrences