Cocconeis clandestina A. Schmidt, 1894

Joh, Gyeongje, 2021, Distribution of the genus Cocconeis (Bacillariophyceae) along the Seogwipo coast of Jeju Island, South Korea, Phytotaxa 528 (3), pp. 149-179 : 154

3. Cocconeis clandestina A. Schmidt ( Figs 23, 24 )

Basionym: Schmidt et al. 1894a, pl. 192, figs 28, 29.

References: Hustedt 1933, p. 331, fig. 784; Witkowski et al. 2000, p. 103, pl. 41, figs 20–25. Description: Valves elliptical to nearly circular, 18–29 μm long, 14–18 μm wide. SV: sternum narrow and linear. Transapical striae biseriate and radiate towards the apices, 5–6 in 10 μm, with 10–12 areolae in 10 μm of stria. No RV observed.

Remarks: This taxon is widespread along the coast of northern Europe ( Hustedt 1933, Witkowski et al. 2000) and common in the Baltic Sea ( Witkowski et al. 2000). In the Seogwipo coast, very rare from small rock pools; it is herein newly described for South Korea.

Figures

FIGURES 3–24. LM micrographs of Cocconeis species (1). Figs 3–5. Cocconeis stauroneiformis, RV (Fig. 3) and SVs (Figs 4, 5). Figs 6–8. C. costata, SVs (Figs 6, 7) and RV (Fig. 8). Figs 9–11. C. capensis, SVs. Figs 12–19. C. distans, SVs (Figs 12, 15, 17–19) and RVs (Figs 13, 14, 16) (Figs 14 and 15, 16 and 17, complete valve). Figs 20, 21. C. pelta, SV (Fig. 20) and RV (Fig. 21). Fig. 22. C. cf. pinnata, SV. Figs 23, 24. C. clandestina, SVs. Scale bar = 10 μm (Figs 3–24).