FIGURE 14 in Taxonomy of epilithic diatoms and teratological forms under the presence of metals in surface sediment

FIGURE 14. Epilithic diatoms from Cascavel River micro-watershed in SEM. A. Achnanthidium caledonicum, rapheless valve. B. A. macrocephalum, rapheless valve. C–E. A. minutissimum. C–D. Raphid and rapheless valve in external view. E. Internal view of rapheless valve. F–G. A. tropicocatenatum, raphid and rapheless valve. H. Brachysira microcephala. I. Luticola ectorii. J. Frustulia weinholdii. K–L. Frustulia australocrassinervia. M. F. neomundana. Scale bars: 2 µm (Figs A–J, M), 5 µm (Fig. K), 1 µm (Fig. L).