Gomphoneis subcapitata 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 : 14

Gomphoneis subcapitata Kociolek, Kulikovskiy & Solak , sp. nov. ( Figs 193–200 , 407)

Valves lanceolate-clavate, headpole distinctly protracted and rounded, footpole narrowly rounded. Length 13.0– 28.5 µm, breadth 2.5–5.5 µm. Axial area narrow, expanded to form an irregularly-shaped, more or less rectangular central area with 1–2 shortened striae on either side at margin. 4 isolated stigmoids, sometimes difficult to distinguish, occur around central area. Raphe lateral, barely undulate, with external proximal raphe ends dilated and round, distal ends straight and extending onto mantle. Striae radiate at center, radiate to parallel at footpole and parallel at headpole, 13–16/ 10 µm. Apical pore field indistinct, formed by rows of porelli. Septa and pseudosepta present at poles. Internally, the valve has a small nearly linear central nodule, with recurved proximal raphe ends. There are pseudosepta and helictoglossae at the poles (Fig. 407).

Type:— RUSSIA: Lake Baikal , shore near Murino village, on algae, N51 o 29.244, E104 o 24.060, 20.07.2011, leg. M. Kulikovskiy ( IBIW slide no. 18569m, holotype designated here (= Fig. 200 ); COLO slide no. 18569p, SZCZ slide no. 18569a, isotypes) .

Observations:— Differentiated from G. asymmetrica by the shape of the valve.

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.