Ulnaria qinghainensis sp. nov., external view, SEM A a valve with valvocopula B detail of middle part from A, note absent central area C–F two poles from A, note two horn-like projections (D, two arrows) and row of poroids terminating before each apex of valvocopula (E, F, wavy arrow respectively). Scale bars: 20 μm (A); 4 μm (B–F).