Diatoma sinensis sp. nov., SEM A a valve with a few girdle bands B a valve with an attached valvocopula C–E details of A showing the two rows of poroids in each band, a third very short row of poroids present (D, arrow), and the poroids continuing at one closed end (E, arrow) F–G details of B showing the valvocopula, note the two rows of poroids continuing at one closed end (F, arrow), silica sawtooth-shaped projections over virgae (G, H, arrows), and an open end (H). Scale bars: 5 μm (A, B); 1 μm (C–H).