Cocconeis suzukii Riaux-Gobin, Compère, Coste, Straub & Taxböck

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

24. Cocconeis suzukii Riaux-Gobin, Compère, Coste, Straub & Taxböck ( Figs 57–61 , 99 )

Basionym: Riaux-Gobin et al. 2014b, p. 213, figs 24–28.

Description: Valves elliptical, 13–20 μm long, 9–11 μm wide. SV: sternum large, elliptical and slightly sigmoid, not constricted in the middle. Transapical striae delicate and radiate towards the apices, 29–32 in 10 μm, but interrupted by a hyaline longitudinal line, one stria shorter in the middle of one side of valve. RV: both raphe and sternum sigmoid, sternum very narrow, the central ends of raphe close each other, but the terminal ends of raphe relatively far from the apices. Central area not developed. Transapical striae radiate towards the apices, 24–28 in 10 μm.

Remarks: This species was designated from F. Meister’s slide specimens, collected from Nagasaki of Japan ( Riaux-Gobin et al. 2014b). It does not appear to have been reported anywhere other than Nagasaki. Along Seogwipo coast, the species was encountered less frequently as epiphyte from small rock pools (St. 2); it is herein newly described 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).

FIGURES 94–99. SEM micrographs of Cocconeis species (9). Fig. 94. Cocconeis cf. diruptoides, the internal view of SV. Fig. 95. C. dirupta var. dirupta, the internal view of SV. Figs 96–98. C. shikinensis, the external view of SV (Figs 97, 98), the internal view of RV (Fig. 96). Fig. 99. C. suzukii, the external view of SV. Scale bars = 1 μm (Figs 94, 98, 99), 2 μm (Figs 95–97).