Gomphoneis inconspicua Kociolek, Kulikovskiy & 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 : 15

Gomphoneis inconspicua Kociolek, Kulikovskiy & Solak , sp. nov. ( Figs 201–214 , 408–409)

Valves small linear-lanceolate clavate with headpole barely protracted, apices rounded. Length 8.5–20.0 µm, breadth 2–3 µm. Axial area narrow, expanded to form a relatively wide, transverse rectangular-shaped central area bordered by a single shortened stria on either side. There are 4 stigmoids, sometimes difficult to distinguish, situated around the central area. Raphe filiform, slightly undulate, with external proximal raphe ends dilated and round. Costate striae radiate, except parallel at headpole.. Striae 16–20/ 10 µm. Apical pore fields indistinct. Septa and pseudosepta small at both poles.

Externally, the striae of this species are composed of two rows of round, unoccluded areolae and they terminate at the axial in in one or two areolae ( Fig. 408). The proximal raphe ends are dilated. The four isolated stigmoids are small and round ( Fig. 408). Internally, the central nodule is inconspicuous and narrow ( Fig. 409). The central nodule has recurved proximal raphe ends. The helictoglossa at the footpole is oriented off-center from the raphe branch ( Fig. 409). A small pseudoseptum is present at the footpole.

Type:— RUSSIA: Lake Baikal , Kultuk, on algae, N51 o 43.460, E103 o 43.096, 21.07.2011, leg. M. Kulikovskiy ( IBIW slide no. 18600m, holotype designated here (= Fig. 201 ); COLO slide no. 18600p, SZCZ slide no. 18600°, isotypes) .

Figures

PLATE 7: LM. Figs 169–174: Gomphoneis metzeltinii sp. nov. Fig. 169 is of the holotype. Figs 175–192: G. cf. subcapitata. Figs 193– 200: G. subcapitata sp. nov. Fig. 200 is of the holotype. Figs 201–214: G. inconspicua sp. nov. Fig. 201 is of the holotype. Figs 215– 222: G sp. cf. subcapitata. Figs 223–228: G. reichardtii sp. nov. Fig. 223 is of the holotype. Figs 229–237: G. sp. cf. skabitchevskii. Figs 238–250: G.sp. cf. skabitchevskii. Figs 251–260: G. skabitchevskii sp. nov. Fig. 258 is of the holotype. Figs 261–282: G.sp. cf. reichardtii. Scale bar = 10 µm for all figures.