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Arca sp.

genus Arca Linnaeus, 1758

• Modern species: middle Permian - Present (268.0 - 0.0 Ma)
• Habitat: Marine

• Classification
• kingdom Animalia, phylum Mollusca, class Bivalvia, order Arcida, family Arcidae

• Distribution
• Miocene: Niigata, Fukui, Ibaraki, Gifu
• Miocene-Pliocene: Fukushima
• Pliocene: Niigata
• Pleistocene: Hokkaido, Aomori, Akita, Ibaraki, Kanagawa, Aichi
• Holocene: Tokyo

• Subtaxa
• A. boucardi
• A. watanabei