Gomphoneis impressa 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 : 22

Gomphoneis impressa Kulikovskiy, Kociolek & Solak , sp. nov. ( Figs 365–367 )

Valves lanceolate-clavate, tapered broadly to the headpole, narrowly to the footpole. Headpole rounded, footpole distinctly rounded. Length 45–66, breadth 9–10 µm. Axial area narrow, broadening to form an irregularly elliptical central area with 4–6 isolated stigmoids. Raphe lateral, more or less straight with dilated external proximal raphe ends. Internal distal raphe ends distinct. Striae radiate about the center, parallel towards the ends, 19–22/ 10 µm. Not distinctly punctate. Septa and pseudosepta present at the poles, especially evident at the footpole. Apical pore fields comprised of condensed rows of striae.

Type:— RUSSIA: Lake Baikal , Boldakovo, on algae, N52 o 35.694, E107 o 17.142, 16.07.2011, leg. M. Kulikovskiy ( IBIW slide no. 18572m, holotype designated here (= Fig. 366 ); COLO slide no. 18572p) .

Observations: — It is not clear to us if the specimen illustrated in figure 365 belongs here, due to the shape of the valve, especially the footpole. However, we have only seen one valve with this unique shape to date.

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.