FIGURES 12–20. Chamaepinnularia taihangensis, SEM. 12–16, external views. 12 in Chamaepinnularia taihangensis sp. nov. (Bacillariophyceae), a new diatom species from Taihang Valley, Shanxi province, China

FIGURES 12–20. Chamaepinnularia taihangensis, SEM. 12–16, external views. 12. Entire valve, showing striae are composed of a elongated chamber-like areolae, and areolae openings covered by vela. 13, 16. View of the apex, with capitate apices, terminal raphe fissures distinct curving, continuing onto the mantle. 14. Center of the valve, showing the proximal raphe expanded and bent slightly to the same side. 15. Showing the siliceous thickening of the vela is thinner and easy to fracture. 17–20, internal views. 17. Entire valve. Showing the areolae openings are interrupted by siliceous bridge that divides striae in two parts.18, 20. View of the apex, distal raphe ends weakly deflected and terminate as helictoglossae. 19. Center of the valve, showing the proximal raphe ends unilaterally hooked. Scale bar = 1 μm.