Pinnularia pseudotabellaria H. Kobayasi 1977

Lee, Sang Deuk, Yun, Suk Min, Cho, Pyo Yun, Yang, Hye-Won & Kim, Oe Jung, 2019, Newly Recorded Species of Diatoms in the Source of Han and Nakdong Rivers, South Korea, Phytotaxa 403 (3), pp. 143-170 : 163

Pinnularia pseudotabellaria H. Kobayasi 1977 *

Figures 101–103

Original description: Kobayasi & Ando (1977).

Key literature: Makita & Tanaka (2018).

Specimen examined: Tables 1, 2.

Dimension: Length 164.3 μm, width 21.4 μm; 10–11 striae in 10 μm on the raphe valve.

Description: Valves are linear, with a slightly swollen center and broadly rounded apices. The axial area is linear and about one-third the breadth of the valve. The central area is rounded and somewhat asymmetrical. Raphe is filamentous and straight. Proximal raphe ends are weakly expanded, deflected to one side, and closely spaced. Terminal raphe fissures are deflected to the primary valve side. The terminal raphe fissures are sickle-shaped. Striae are slightly parallel or weakly radiate throughout most of the valve.

Remarks: Pinnularia pseudotabellaria is distinguished from Pinnularia tabellaria by the arrangement of the striae and by the dissimilar terminal fissures. This species is also similar to Pinnularia hustedtii , but differs in that the ultra-structure of the raphe is filamentous ( Kobayasi & Ando 1977).

Distribution and ecology: This species was found on surface sediment in a lagoon Hamabun-numa of lake Biwa from Japan in November 2013 ( Makita & Tanaka 2018).