Gomphonema angustatum (Kützing) Rabenhorst (1864: 283)

Amaral, Mailor Wellinton Wedig, Medeiros, Gabriela, Daufenbach, Vanessa, Sampaio, Silvio Cesar, Reis, Ralpho Rinaldo Dos, Ludwig, Thelma Alvim Veiga & Bueno, Norma Catarina, 2024, Taxonomy of epilithic diatoms and teratological forms under the presence of metals in surface sediment, Phytotaxa 647 (3), pp. 237-273 : 248

Gomphonema angustatum (Kützing) Rabenhorst (1864: 283)

Figs 6 : F–H

Length: 24.8–35.2 µm; width: 5.2–7.1 µm; striae: 11–13 in 10 µm (n = 6)

Teratological form: deformed valve outline, with protrusion, or bent apices. Unusual striae pattern, usually becoming more radiate.

Occurrence: S2, S3, S6.

Ecological characteristics: Cond.: 21.00–53.00 µS cm –1; BOD: 1.49–10.03 mg L− 1; COD: 8.08–24.32 mg L− 1; N-NH: 200–378 µg 3 − 1 − 1 − 1 − − 1 − 1 L; NO: 0.37–9.69 mg L; DO: 8.98–14.57 mg L; pH: 6.02–6.80; PO: 0.002 –0.030 mg L; TP: 0.01–0.04 mg L; 3 4 TS: 20.00–72.00 mg L− 1; Temp.: 17.37–21.82 °C; Turb.: 1.93–14.57; Flow: 0.31–2.78 m 3 s; Average depth: 0.09–0.29 m; Prec.: 3.48–9.96 mm.

Metal concentrations: Co: 17.50–58.28 mg L –1; Cr: 23.10–85.16 mg L –1; Cu: 153.45–259.07 mg L- 1; Mn: 370.99–622.76 mg L –1; Ni: 31.80–69.89 mg L –1; Pb: 33.49–57.94 mg L –1; Zn: 71.00– 412.52 mg L –1.

Figures

FIGURE 6. Epilithic diatoms from Cascavel River micro-watershed in LM. A–B. Gomphonema affine. C–H. G. angustatum. F–H. Teratological valves. I. G. brasiliense. J–K. G. brasiliense subsp. pacificum. L. G. brasiliensoide. M–O. G. exilissimum. P–R. G. parvulum. S. G. frequentiformis. T–Y. G. graciledictum. W–Y. Teratological valves. Z. G. perapicatum. AA–AB. G. hawaiiense. AC. G. guaraniarum. AD–AF. G. saprophilum. AG–AI. G. pseudoaugur. AJ–AM. G. pumilum. AM. Teratological valve. AN–AS. G. lagenula. AQ–AS. Teratological valves. AT–AU. G. naviculoides. AU. Teratological valve. Scale bars: 10 µm.