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Mactra sp.

genus Mactra Linnaeus, 1767

• Modern species: Early Jurassic - Present (196.5 - 0.0 Ma)
• Habitat: Marine

• Classification
• kingdom Animalia, phylum Mollusca, class Bivalvia, family Mactridae

• Distribution
• Miocene: Hokkaido, Fukushima, Nagano, Mie, Hiroshima
• Pliocene: Tokyo
• Quaternary: Hiroshima
• Pleistocene: Hokkaido, Ibaraki, Tokyo, Chiba, Kanagawa, Aichi
• Holocene: Ishikawa, Saitama, Tokyo, Chiba, Aichi, Osaka

• Subtaxa
• M. chinensis
• M. crossei
• M. nipponica
• M. quadrangularis