Ulnaria hupingensis sp. nov., internal view, SEM A a valve with valvocopula B middle detail from A, note the row of poroids interrupted in the middle (two arrows) C, E two poles from A. D Apical detail from C, note two rimoportulae at one apex (two arrows) F apical detail from E, note one rimoportula at one apex. Scale bars: 20 μm (A); 2 μm (B–F).