Rotational symmetry of cell face outline 180 degrees, one end is a reflection of the other, as are the two halves
5. Please select the position of any slit-like canals (raphes) on the cell surface.
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Slit like canals totally absent
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Slit-like canal running down the edge of the cell face (may be difficult to see directly, but striations can be seen at one edge)
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Slit-like canal (raphe) running down the centre of the cell surface, on at least one of the two cell faces.
