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Operculina sp.
genus Operculina d'Orbigny, 1826
- Modern species: Early Cretaceous - Present (125.5 - 0.0 Ma)
- Classification
- kingdom Chromista, infrakingdom Rhizaria, phylum Foraminifera, class Globothalamea, order Loftusiida, family Nummulitidae
- Distribution
- Miocene: Hokkaido, Aomori, Akita, Yamagata, Niigata, Ishikawa, Fukui, Ibaraki, Gifu, Okayama, Hiroshima