Gomphoneis witkowskii 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 : 13

Gomphoneis witkowskii Kulikovskiy, Kociolek & Solak , sp. nov. ( Figs 159–168 , 388)

Valves lanceolate-clavate, with apices rounded. Length 20–34 µm, breadth 5.0– 6.5 µm. Axial area narrow, becoming wider towards the center, forming a rounded to angular central area. 4 isolated stigmoids present around the central area. Raphe lateral, more or less straight, with external proximal ends dilated slightly. External distal raphe ends straight and extend onto the valve mantle. Striae are costate, radiate in the center and to the footpole, and radiate to parallel to the headpole. Striae 13–16/ 10 µm. Septa and pseudoseptae evident at the apices. Apical pore field distinct, composed of distinct lines or rows of porelli.

In the SEM the valve exterior of this species appears similar to other taxa in the genus, having doublypunctate striae, stigmoids that occur in small, round depressions, and dilated proximal raphe ends (Fig. 388).

Type:— RUSSIA: Lake Baikal , shore near Murino village, on algae, N51 o 29.244, E104 o 24.060, 20.07.2011, leg. M. Kulikovskiy ( IBIW slide no. 18569m, holotype designated here (= Fig. 168 ); COLO slide no. 18569p, SZCZ slide no. 18569°, isotypes) .

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.