Navicula cryptocephala Kützing (1844: 95)

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 : 255

Navicula cryptocephala Kützing (1844: 95)

Figs 10 : G–I

Length: 19.9–26.1 µm; width: 4.7–6.9 µm; f striae: 16–18 in 10 μm (n = 3)

Teratological form: deformed valve outline, with loss of transapical symmetry.

Occurrence: S2.

Ecological characteristics: Cond.: 52.00 µS cm –1; BOD: 4.16 mg L− 1; COD: 17.43 mg L− 1; N-NH: 316 µg L− 1; NO: 0.32 mgL−1; DO: 3 3 − 1 − − 1 − 1 − 1 3 14.62 mg L; pH: 6.04; PO: 0.004 mg L; TP: 0.012 mg L; TS: 16.00 mg L; Temp.: 17.90 °C; Turb.: 9.25; Flow: 0.45 m s; 4 Average depth: 0.19 m; Prec.: 9.96 mm.

Metal concentrations: Co: 19.28–23.11 mg L –1; Cr: 25.92–83.62 mg L –1; Cu: 196.71–241.52 mg L- 1; Mn: 400.50–955.89 mg L –1; Ni: 33.21–59.59 mg L –1; Pb: 36.28–38.28 mg L –1; Zn: 78.35–169.95 mg L –1.

Figures

FIGURE 10. Epilithic diatoms from Cascavel River micro-watershed in LM. A. Capartogramma crucicula. B. Gyrosigma acuminatum. C. G. obtusatum. D–E. Navicula eichhorniaephila. F–I. N. cryptocephala. G–I. Teratological valves. J. N. angusta. K. N. leptostriata. L–M. N. cryptotenella. M. Teratological valve. N. N. radiosa. O–P. N. tenelloides. Q. N. symmetrica. R. N. schwabei. S. N. rostellata. T–U. N. salinicola. V–W. Craticula submolesta. W. Teratological valve. X. C. ambigua. Y–Z. C. riparia. Z. Teratological valve. AA–AB. Stauroneis smithii. AC. S. gracilis. AD. S. neohyalina. AE. S. phoenicenteron. AF–AG. Chammaepinnularia brasilianopsis. AH. Pseudofallacia monoculata. AI–AJ. Kobayasiella parasubtilissima. AK. Halamphora montana. AL. H. normanii. AM. Amphora copulata. Scale bars: 10 µm.