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Tresus sp., Horse clam(s)

genus Tresus Gray, 1853

• Modern species: Pliocene - Present (3.6 - 0.0 Ma)
• Habitat: Marine

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

• Distribution
• Quaternary: Hiroshima
• Pleistocene: Ibaraki, Tokyo, Chiba, Kanagawa, Aichi

• Subtaxa
• T. keenae