Eunotia bilunaris (Ehrenberg) Schaarschmidt (1880: 159)

Eunotia bilunaris (Ehrenberg) Schaarschmidt (1880: 159)

Figs 4 View FIGURE 4 : G–J, 13: A

Length: 11.8–88.9 µm; width: 2.4–4.7 µm; striae: 15–19 in 10 µm (n = 49)

Teratological form: deformed valve outline, undulated, with protrusion, slight or strong constriction in the median portion of the valve, or strong bent ventrally or near the apices.

Occurrence: S1, S2, S3, S4, S6, S8.

Ecological characteristics: Cond.: 41.00–70.00 µS cm –1; BOD: 0.89–9.35 mg L− 1; COD: 1.20–20.32 mg L− 1; N-NH: 18–316 µg L− 1; NO: 3 3 − 1 − 1 − − 1 − 1 0.32–9.31 mg L; DO: 7.70–19.50 mg L; pH: 5.79–6.99; PO: 0.003 –0.022 mg L; TP: 0.007 –0.040 mg L; TS: 10.00–174.00 4 mg L− 1; Temp.: 17.37–23.56 °C; Turb.: 2.47–37.50; Flow: 0.07–5.49 m 3 s; Average depth: 0.04–0.42 m; Prec.: 2.37–11.17 mm.

Metal concentrations: Co: 17.50–47.24 mg L –1; Cr: 21.98–81.32 mg L –1; Cu: 160.64–263.62 mg L- 1; Mn: 349.80–502.78 mg L –1; Ni: 27.57–66.65 mg L –1; Pb: 33.49–66.21 mg L –1; Zn: 78.97–170.48 mg L –1.