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Aspidisca sp.
Species name:Aspidisca sp.
Bureau Swerage, Tokyo Metropolitan Government
The size of Aspidisca is 25-50 μm in length. Its cell is ovoided. The back of the body is a saw tooth shape raised. There are seven cirri on the front and five on the back of the cell. They are similar to ladybird, so cirri look like small feet.