Pinnularia rabenhorstii Krammer 2000

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 rabenhorstii Krammer 2000 *

Figures 104–106

Basionym: Navicula rabenhorstii Grunow 1860 .

Synonyms: Navicula rabenhorstii Grunow 1860 ; Navicula lata var. rabenhorstii (Grunow) Prochazka 1923 ; Pinnularia lata var. rabenhorstii (Grunow) Cleve 1895 ; Pinnularia lata var. thuringiaca (Rabenhorst) Mayer 1917 ; Pinnularia lata f. thuringiaca Hustedt 1930 .

Original description: Krammer (2000), p. 22, pl. 4, fig. 1, pl. 5, figs 1–11, pl. 6, figs 1–4, nom. illeg.

Key literature: Zindarova et al. (2016)

Specimen examined: Tables 1, 2.

Dimension: Length 61.7–64.2 μm, width 14.4–15.5 μm; 4–5 striae in 10 μm on the raphe valve.

Description: The valves are strongly silicified, linear or linear-elliptic with straight to slightly convex margins. The valve apices are broadly rounded. The axial area is more or less broad. The striae are distinct and wide, slightly radiate at the centre, becoming convergent near the poles. The central striae slightly shorter, forming a widened, round to squarish central area. The raphe somewhat curved, with comma-shaped terminal fissures. The proximal raphe ends are expanded, rounded, distinctly hooked, and distal ends curved in opposite direction. The striae are multiseriate, chambered, each chamber containing many rows of small rounded poroids, striae parallel, distantly placed from each other, widely spaced, more or less alternating on opposite sides of the valve.

Distribution and ecology: This species prefers cold oligotrophic waters in mountains ( Krammer 2000).