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Crenotiatibetia sp. nov. SEM internal view of the raphe valve A internal view of the whole view B, C apices of the valve D central area of the valve internally E magnification of the areolae, showing the horseshoes areola at the end of striae F internal view of a developing valve. Scale bar: 1 μm (A, B, C, D, F); 500 nm (E).
