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Retusidae gen. et sp. indet., Barrel-bubble snail(s)

family Retusidae Thiele, 1925

• Modern species: Middle Jurassic - Present (164.7 - 0.0 Ma)
• Habitat: Marine

• Classification
• kingdom Animalia, phylum Mollusca, class Gastropoda, order Cephalaspidea

• Distribution
• Pleistocene: Chiba