Gomphonema lagenula Kützing (1844: 85)

Figs 6: AQ– AS, 13: J

Length: 10–17.4 µm; width: 4.9–6 µm; striae: 14–18 in 10 µm (n = 23)

Teratological form: deformed valve outline, undulated, or with bent apices. Unusual striae pattern, usually strongly radiate in the median portion of the valve.

Occurrence: S1, S2, S3, S4, S6, S7, S8.

Ecological characteristics: Cond.: 1.00–63.00 µS cm –1; BOD: 1.19–13.96 mg L− 1; COD: 1.23–24.65 mg L− 1; N-NH: 3–448 µg L− 1; NO: 3 3 − 1 − 1 − − 1 − 1 0.32–13.60 mg L; DO: 7.18–26.24 mg L; pH: 5.28–6.79; PO: 0.002 –0.050 mg L; TP: 0.005 –0.036 mg L; TS: 4.00–84.0 4 mg L− 1; Temp.: 16.60–21.82 °C; Turb.: 1.93–10.70; Flow: 0.06–5.88 m 3 s; Average depth: 0.02–1.32 m; Prec.: 2.39–11.17 mm.

Metal concentrations: Co: 17.50–60.76 mg L –1; Cr: 23.10–79.78 mg L –1; Cu: 163.45–301.34 mg L- 1; Mn: 370.99–809.37 mg L –1; Ni: 29.18–87.39 mg L –1; Pb: 33.49–57.94 mg L –1; Zn: 71.00– 296.79 mg L –1.