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Opercularia sp.
Species name:Opercularia sp.
Bureau Swerage, Tokyo Metropolitan Government
The size of Opercularia is 35-250 μm in length. There is not myoneme in the stalk. The stalks branched to polykinetids. There are chilium on the disk elevated from top of the cell body. It has undulating membranes of the adoral zone and use them for feeding.