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Arcidae gen. et sp. indet., Ark clam(s)

family Arcidae Lamarck, 1809

• Modern species
• Habitat: Marine

• Classification
• kingdom Animalia, phylum Mollusca, class Bivalvia, order Arcoida

• Distribution
• Oligocene: Hokkaido
• Paleogene-Neogene: Nagano
• Miocene: Hokkaido, Akita, Iwate, Miyagi, Niigata, Nagano, Yamanashi, Toyama, Ishikawa, Fukui, Tochigi, Ibaraki, Saitama, Aichi, Gifu, Mie, Kyoto, Okayama, Hiroshima, Tottori, Shimane, Yamaguchi, Kagawa
• Miocene-Pliocene: Fukushima, Nagano
• Pliocene: Hokkaido, Aomori, Miyagi, Niigata, Nagano, Tokyo, Shizuoka
• Pliocene-Pleistocene: Niigata, Saitama, Kanagawa, Kochi
• Quaternary: Hiroshima
• Pleistocene: Hokkaido, Aomori, Akita, Toyama, Ishikawa, Fukui, Ibaraki, Tokyo, Chiba, Kanagawa, Shizuoka, Aichi, Mie, Kyoto, Kochi, Oita
• Holocene: Toyama, Ishikawa, Saitama, Tokyo, Aichi, Osaka
• Investigation in progress: Saitama (Miocene?), Tokyo, Kyoto

• Subtaxa
• Anadara, genus
• Arca, genus
• Barbatia, genus
• Hawaiarca, genus
• Mesocibota bistrigata
• Mimarcaria matsumotoi
• Tegillarca, genus
• Trisidos, genus