Navicula nipponica (Skvortzov) Lange-Bertalot 1993

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 : 161-162

Navicula nipponica (Skvortzov) Lange-Bertalot 1993 *

Figures 81–83

Synonyms: Navicula radiosa f. nipponica Skvortzov (1936) .

Original description: Lange-Bertalot (1993).

Key literatures: Lange-Bertalot (1993); Ohtsuka & Tuji (2002); Ohtsuka et al. (2009); Watanabe et al. (2005). Specimen examined: Tables 1, 2.

Dimension: Length 35.2 μm, width 7.1 μm; 13 striae in 10 μm on the raphe valve.

Description: Valves are elliptic-lanceolate to broadly lanceolate, with obtusely rounded and slightly acuminate apices. The raphe is weakly lateral. Proximal raphe ends are deflected to the secondary side. Distal raphe fissures are hooked to the secondary side. The axial area is narrow. The central area is moderately large, dilated and asymmetric. Striae are radiate, becoming convergent at the apices.

Remarks: Ohtsuka & Tuji (2002) referred to Lange-Bertalot (1993) thought N. radiosa f. nipponica Skvortzow to be an independant species distinct from N. radiosa Kützing and named it N. nipponica (Skvortzow) Lange-Bertalot.

Distribution and ecology: According to Skvortzow (1936), Navicula nipponica was found predominantly in epipelic algal assemblages in benthic environment in Lake Biwa and Lake Kizaki. This species prefers neutral water and saproxenous taxa ( Watanabe et al. 2005).