Caloneis nanyiensis sp. nov. SEM views of valve interior. A Internal view of an entire valve; note the raphe is filiform and slightly arched B, C details of the proximal raphe endings which are deflected to the same side D, E details of the distal raphe ends terminating as helictoglossae and the striae are composed of 2–4 areolae on the mantle. Scale bars: 5 µm (A); 2 µm (B, C); 1 µm (D, E).