Cocconeis capensis (Cholnoky) Witkowski

Joh, Gyeongje, 2021, Distribution of the genus Cocconeis (Bacillariophyceae) along the Seogwipo coast of Jeju Island, South Korea, Phytotaxa 528 (3), pp. 149-179 : 152-154

2. Cocconeis capensis (Cholnoky) Witkowski ( Figs 9–11 )

References: Cholnoky 1963, p. 42, figs 6, 7; Witkowski et al. 2000, p. 103, pl. 40, figs 9, 10; Riaux-Gobin et al. 2017, p. 58, figs 20–23.

Description: Valves elliptical, 10–17 μm long, 5–10 μm wide. SV: sternum linear, and central area not developed. Transapical striae coarse, composed of elongated areolae, 20–22 in 10 μm, crossed by a hyaline longitudinal line, and radiate towards the apices. Striae as bundle of 1–3 rows of areolae. One row of dense areolae on the margins of valve. A complete frustule is observed ( Fig. 12 ).

Remarks: This species was previously reported as Cocconeis clandestina var. capensis Cholnoky from the type locality of the Steanbras River of South Africa ( Cholnoky 1963), and from Saldanha Bay of South Africa ( Giffen 1976). It occurred in the Azores of Portugal ( Stidolph et al. 2012), and in Nagasaki of Japan ( Riaux-Gobin et al. 2017). In the Seogwipo coast of Jeju Island, rare in a single sample on seaweeds collected from a small rock pool; 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).