FIGURES 28–31. Gomphonema bicepiformis, SEM. Internal view. 28 in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China

FIGURES 28–31. Gomphonema bicepiformis, SEM. Internal view. 28. Whole valves, showing pseudosepta at both ends and helictoglossae. 29. Central portion of the valve showing deflected central raphe endings, and internal opening of the stigma. 30. Interior view of the headpole showing the small helictoglossa. 31. Internal view of footpole showing the helictoglossa, pseudoseptum and raphe slit. Scale bars = 10 μm(Fig. 28), 2 μm(Figs 29–31).