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Calyptogena sp.

genus Calyptogena Dall, 1891

• Modern species: early Eocene - Present (48.6 - 0.0 Ma)
• Habitat: Marine, 800-1200 m deep, Cold seeps

• Classification
• kingdom Animalia, phylum Mollusca, class Bivalvia, order Veneroida, family Vesicomyidae

• Distribution
• Eocene: Hokkaido
• Miocene: Hokkaido, Nagano, Kanagawa
• Miocene-Pliocene: Hokkaido, Nagano, Kanagawa
• Pliocene: Niigata, Chiba
• Pliocene-Pleistocene: Kanagawa
• Pleistocene: Kanagawa, Chiba, Kanagawa

• Subtaxa
• C. nipponica
• C. pacifica