Gomphoneis russica Kociolek & Kulikovskiy, 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 : 21

Gomphoneis russica Kociolek & Kulikovskiy , sp. nov. ( Figs 353–359 )

Valves lanceolate-clavate with headpole broadly rounded, footpole rounded. Length 47–68 µm, breadth 11–14 µm. Axial area straight, expanded to form a bow-tie shaped central area, bordered by 4–5 shortened striae on either side. Isolated stigmoids general wanting, but 1–2 may rarely be present around the central area. Raphe lateral, undulate, with external proximal ends dilated and distal ends deflected onto the valve mantle. Striae composed of double rows of areolae, visible with the LM. Striae radiate around the center and to the footpole, becoming parallel towards the headpole, 11–15/ 10 µm. Prominent septa and pseudosepta occur at the poles. The apical pore field is not distinguishable from the striae, appearing slightly shorter than striae at the footpole.

Type:— RUSSIA: Lake Baikal , Cape Khoboj, stones and algae, 1998, Darwin Initiative sample ( COLO slide for Station 9, number 9, holotype designated here (= Fig. 353 ); IBIW slide no. Station 9, number 9m, isotype) .

Figures

PLATE 9: LM. Figs 353–359: Gomphoneis russica sp. nov. Fig. 353 is of the holotype. Figs 360–364: G. subrussica sp. nov. Fig. 364 is of the holotype. Figs 365–367: G. impressa sp. nov. Fig. 366 is of the holotype. Scale bar = 10 for all figures.