Gomphoneis rotundata Kulikovskiy & Kociolek, 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 rotundata Kulikovskiy & Kociolek , sp. nov. ( Figs 128–131 )

Valves lanceolate-clavate, with apices rounded. Length 23–29 µm, breadth 5–6 µm. Axial area narrow straight, expanded to form an irregularly-shaped, somewhat circular central area bordered by 2–3 shortened striae on either side, more coarsely arranged than other striae. 4 stigmoids present around the central area. Raphe lateral, more or less straight, with external proximal ends rounded. External distal raphe ends extend nearly straight onto the valve mantle. Costate striae strongly radiate, except parallel at the headpole. Striae 14–16/ 10 µm. Apical pore fields indistinct. Septa and pseudosepta evident at the poles.

Type:— RUSSIA: Lake Baikal , N52 o 27.042, E106 o 53.215. Bay near Enkhaluk village, fouling on the wood, 14.07.2011, leg. M. Kulikovskiy ( IBIW slide no. 18589m, holotype designated here (= Fig. 129 ); COLO slide no. 18589p; SZCZ slide no. 18589a, 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.