Diploneis pseudovalis Hustedt, 1930

Jovanovska, Elena, Levkov, Zlatko & Edlund, Mark B., 2015, The genus Diploneis Ehrenberg ex Cleve (Bacillariophyta) from Lake Hövsgöl, Mongolia, Phytotaxa 217 (3), pp. 201-248 : 232

Diploneis pseudovalis Hustedt ( Figs 170–172 )

Valves are linear-elliptic with slightly convex margins and round ends. The valve length is 29.5–36.5 μm and the valve breadth is 10.5–11.0 μm. The axial area is narrow, linear to linear-lanceolate expanding into a moderately large central area. The central area is elongate-ovoid and 3.0–3.5 μm wide. The longitudinal canal is linear to lanceolate with two rows of areolae throughout its whole length, expanding in the middle of the valve. The raphe branches are straight and simple, positioned with an expanded depression. Striae are biseriate, radiate throughout, 12(13) in 10 μm, consisting of small round areolae, 20–25 in 10 μm along a single row of the biseriate pattern.

Ecology and Distribution: —M272A; M289A; M290A: found in northern Lake Hövsgöl on Chara and sediment collections taken from 4 to 30 m depth .

Figures

FIGURES 166–183. LM valve views. Figs 166–169. Diploneis elliptica cf. var. ladogensis. Figs 170–172. Diploneis pseudovalis. Figs 173–178. Diploneis subovalis. Fig. 179. Diploneis mongolica. Figs 180–183. Diploneis spectabilis. Scale bar = 10 μm.