Pinnularia graciloides var. latecapitata Metzeltin & Krammer (1998: 176)

Fig. 9: B

Length: 38.2–50.8 μm; width: 7.4–8.9 µm; striae: 12–13 in 10 µm (n = 3)

Teratological form: deformed valve outline, with sigmoid shape.

Occurrence: S2, S4, S7.

Ecological characteristics: Cond.: 65.00 µS cm –1; BOD: 1.00 mg L− 1; COD: 2.55 mg L− 1; N-NH: 200 µg L− 1; NO: 2.90 mg L− 1; DO: 3 3 − 1 − − 1 − 1 − 1 3 12.12 mg L; pH: 6.40; PO: 0.05 mg L; TP: 0.02 mg L; TS: 95.00 mg L; Temp.: 17.93 °C; Turb.: 3.78; Flow: 0.94 m s; 4 Average depth: 0.24 m; Prec.: 2.37–4.96 mm.

Metal concentrations: Co: 17.50–57.56 mg L –1; Cr: 24.23–83.01 mg L –1; Cu: 195.31–273.01 mg L- 1; Mn: 370.99–745.82 mg L –1; Ni: 33.62–85.63 mg L –1; Pb: 33.49–54.83 mg L –1; Zn: 78.88–258.21 mg L –1.