Cocconeis arenicola Riznyk emend. Al-Handal & Riaux-Gob., 1973

Al-Handal, Adil Y., Riaux-Gobin, Catherine, Jahn, Regine, Wulff, Angela Katarina & Minerovic, Alison, 2019, Two new marine species of Cocconeis (Bacillariophyceae) from the west coast of Sweden, European Journal of Taxonomy 497, pp. 1-16 : 12

Cocconeis arenicola Riznyk emend. Al-Handal & Riaux-Gob.

Figs 8–9

Emended description

Valve elliptical with broadly rounded apices, 24.6 × 17.7–17.9 µm. SV with narrow and linear axial area (sternum) and small round central area. Striae radiate, equidistant, composed of large and round areolae, 9–9.8 in 10 µm. Areolae 16–18 in 10 µm. Short marginal striae of smaller areolae are present. RV with straight raphe, proximal raphe endings close to each other, distal endings terminate very shortly before apices. Striae radiate, equidistant with rounded areolae, 12–16 in 10 µm.

Figures

Figs 2–9. LM images. 2–4. RV of C. magnoareolata Al-Handal, Riaux-Gob., R.Jahn & A.K.Wulff sp. nov., showing variations in size and valve outline (BGBM, slide B 40 0043104). 5–7. SV of C. magnoareolata sp. nov. (BGBM, slide B 40 0043104). 8–9. SV and RV of C. arenicola Ryznik (ANSP, slide no. 62634). Scale bars: 10 µm.