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Glycymeris sp., Bittersweet clam(s)

genus Glycymeris da Costa, 1778

• Modern species: Early Cretaceous - Present (112.6 - 0.0 Ma)
• Habitat: Marine

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

• Distribution
• Cretaceous: Fukushima, Ehime
• Eocene: Nagasaki
• Oligocene: Fukushima, Fukuoka, Saga
• Miocene: Akita, Miyagi, Fukushima, Niigata, Nagano, Yamanashi, Toyama, Gunma, Tochigi, Saitama, Tokyo, Kanagawa, Aichi, Gifu, Mie, Shiga, Shimane, Yamaguchi, Kagawa, Fukuoka
• Miocene-Pliocene: Fukushima, Nagano, Kanagawa
• Pliocene: Hokkaido, Aomori, Niigata, Nagano, Yamanashi, Toyama, Chiba, Kanagawa, Shizuoka
• Pliocene-Pleistocene: Niigata, Ishikawa, Kanagawa, Kochi
• Quaternary: Hiroshima
• Pleistocene: Akita, Niigata, Toyama, Ishikawa, Ibaraki, Saitama, Tokyo, Chiba, Kanagawa, Shizuoka, Aichi, Kochi
• Holocene: Saitama
• Investigation in progress: Nagano, Yamanashi, Saitama (Miocene?)

• Subtaxa
• G. albolineata
• G. altoumbonata
• G. aspersa, Clothed bittersweet
• G. cisshuensis
• G. convexa
• G. crassa
• G. idensis
• G. ikebei
• G. matsumoriensis
• G. miyagiensis
• G. munda
• G. nakamurai
• G. nakosoensis
• G. nipponica
• G. osozawaensis
• G. pilsbryi
• G. rotunda
• G. totomiensis
• G. vestitoides
• G. yamasakii
• G. yessoensis