Cocconeis voigtii Meister 1937

Joh, Gyeongje, 2021, Distribution of the genus Cocconeis (Bacillariophyceae) along the Seogwipo coast of Jeju Island, South Korea, Phytotaxa 528 (3), pp. 149-179 : 170

25. Cocconeis voigtii Meister 1937 ( Figs 65–68 )

Basionym: Meister 1937, p. 266, pl. 10, fig. 5.

Reference: Riaux-Gobin et al. 2017, p. 46, figs 1, 24–29.

Description: Valves elliptical, 32–58 μm long, 24–45 μm wide. SV: sternum broadly lanceolate, the terminal ends of the sternum slightly large and formed as a pear-shaped hyaline area, and connected to the submarginal hyaline band. Transapical striae slightly radiate towards the apices, 17–21 in 10 μm, crossed by 2–3 longitudinal hyaline lines, outer striae between the sternum and submarginal hyaline band crossed by narrow and wavy longitudinal lines. RV: raphe weakly sigmoid, sternum very narrow and connected to crescent-shaped hyaline area in the apices, the ends of raphe distant from the apices. Central area small and rhombic. A longitudinally depressed area between the raphe and valve margins forming clear submaginal rims. Transapical striae distinctly punctate and radiate towards the apices, striae of inner parts 19–25, with 18–20 areolae in 10 μm of stria.

Remarks: The original description of this taxon was emended by Riaux-Gobin et al. (2017), adding the description of its RV. Previously, the species appears to only have been found at the type locality of Nagasaki, Japan. Along the Seogwipo coast of Jeju Island, it was encountered infrequently as epiphyte from a small rock pool (St. 2), and is herein newly reported for South Korea.

Figures

FIGURES 57–68. LM micrographs of Cocconeis species (4). Figs 57–61. Cocconeis suzukii, RVs (Figs 57, 59) and SVs (Figs 58, 60, 61) (Figs 57 and 58, 59 and 60, complete valves) Figs 62, 63. C. cyclophora var. meisteri, SV. Fig. 64. C. cyclophora var. decora, SV. Figs 65–68. C. voigtii, RVs (Figs 65, 68) and SVs (Figs 66, 67). Scale bar = 10 μm (Figs 57–68).