Gomphoneis tumidioides Kulikovskiy, Kociolek & 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 : 11

Gomphoneis tumidioides Kulikovskiy, Kociolek & Solak , sp. nov. ( Figs 120–127 )

Valves lanceolate-clavate with headpole and footpole rounded, apices not protracted. Length 25–52 µm, breadth 6.5–9.0 µm. Axial area straight, expanded to form a distinctly circular central area, with 4 isolated stigmoids situated around the central area. Central area not expanded to the margin. Raphe lateral, straight, with external proximal raphe ends distinctly dilated. External distal raphe ends extend nearly straight onto the valve mantle. Striae costate, radiate about the center of the valve, to the footpole and towards the headpole, before becoming parallel at the apex. Striae 11–15/ 10 µm. Apical pore field distinct, composed of defined rows of porelli. Septa and pseudosepta distinct, especially at the footpole.

Type:— RUSSIA: Lake Baikal , N52 o 28.997, E106 o 57.601. Shore near Enkhaluk village, on stone, 15.07.2011, leg. M. Kulikovskiy ( IBIW slide no. 18584m, holotypus here designated (= Fig. 120 ); COLO slide no. 18584p, SZCZ slide no. 18584a, isotypes) .

Etymology:— The species resembles G. tumida in outline.

Observations:— Distinguished from G. witkowskii by the more rounded valves, and more rounded central area.

Figures

PLATE 6: LM. Figs 120–127: Gomphoneis tumidoides sp. nov. Fig. 120 is of the holotype. Figs 128–131: G. rotundata sp. nov. Fig. 129 is of the holotype. Figs 132–143: G. gracilis sp. nov. Fig. 142 is of the holotype. Figs. 144–152: G. sp. cf. witkowskii. Figs 153– 158: G. lange-bertalotii sp. nov. Fig. 155 is of the holotype. Figs 159–168: G. witkowskii sp. nov. Fig. 168 is of the holotype. Scale bar = 10 µm for all figures.