Gomphoneis cf. subcapitata, Kociolek, Kulikovskiy & Solak, 2013

Kociolek, John P., Kulikovskiy, Maxim S. & Solak, Cüneyt N., 2013, The diatom genus Gomphoneis Cleve (Bacillariophyceae) from Lake Baikal, Russia, Phytotaxa 154 (1), pp. 1-37 : 15

Gomphoneis cf. subcapitata (Figs 215–222, 405)

Valves linear-lanceolate clavate, with apices rounded. Length 19–29 µm, breadth 3.0– 4.5 µm. Axial area straight, expanded to form an irregularly-shaped, asymmetrical more or less rectangular central area bordered by 1–2 shortened striae on either side. 4 isolated stigmoids present around central area. Raphe lateral, straight, with external proximal raphe ends dilated and distal ends extend onto mantle. Striae radiate to parallel, 12–15/ 10 µm. Apical pore fields distinct, formed by rows of porelli. Septa and pseudosepta present at poles.

In the SEM, external proximal raphe ends are dilated and elongate, while the distal raphe ends are deflected on the valve face and then proceed onto the mantle (Fig. 405). Two of the stigmoid openings appear larger than the other two (Fig. 405).