Gomphoneis cf. skabitchevskii, 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 : 17

Gomphoneis cf. skabitchevskii ( Figs 229–250 )

Valves elliptical-clavate, slightly tumid at center with slightly protracted rounded headpole and narrowly rounded footpole. Length 12–27 µm, breadth 4.5–7.0 µm. Axial area narrow, expanded to form a transversely widened, irregular to rectangular central area bordered by 1–2 shortened striae on either side, near the margin. 4 isolated stigmoids, usually arranged offset from one another, occur around the central area. The raphe is broadly lateral, undulate, with external proximal raphe ends rounded. External distal raphe ends extend straight onto the valve mantle at both apices. Costate striae radiate, except at the headpole where they become nearly parallel. Striae 17–20/ 10 µm. Apical pore field small. Septa and pseudosepta at the poles, indistinct.

Observations:— This size series is very similar to G. skabitchevskii , differing only slightly in the outline of the valve. This populations looks to be slightly more robust than the new species described here.

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.