PLATE 13, FIGURES 77–83. G. stoermeri. SEM. Figs 78–80, external views. Fig. 78 in New Gomphoneis Cleve (Bacillariophyceae: Gomphonemataceae) species from Xinjiang Province, China

PLATE 13, FIGURES 77–83. G. stoermeri. SEM. Figs 78–80, external views. Fig. 78. Headpole, showing slight bend in the raphe branch, which does not extend onto the mantle. Striae composed of two rows of areolae extend well onto the mantle. Fig. 79. Central area with striae tapering from double to single rows and proximal raphe ends are dilated. Fig. 80. Apical pore field has porelli aligned in double rows at the footpole. The raphe bends slightly before bisecting the pore field. Figs 77, 81–83, internal views. Fig. 77. Entire valve view, with central nodule, helictoglossae and pseudoseptae prominent. The expanded central area is distinct. Figs 81, 83. Headpole and footpole, respectively., with helictoglossae prominent and pseudosepta present. Fig. 82. Central area with raised central nodule bearing proximal raphe ends recurved. Striae taper from doubly punctate to uniseriate. Prominent thickenings oriented perpendicular to the interstriae occur at the point when the striae have single rows of areolae.