Ulnaria fanjingensis sp. nov., external view, SEM A a complete valve B middle detail from A, showing the clear central area C middle detail of another valve showing the central area D a pole from A, note the slightly radiated striae and sub-capitate apex E, F two apices from A, note two largest horn-like projections and ocellulimbus. Scale bars: 20 μm (A); 2 μm (B–D); 1 μm (E, F).