FIGURES 276–310 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species

FIGURES 276–310. LM and SEM images of Achnanthidium vandevijveri sp. nov. from the type (SP-469485) from Garças Lake, São Paulo state. Figure 282 corresponds to the holotype. 276–291. LM views of raphe valves. 292–306. LM views of rapheless valves. 307, 308. SEM external view of raphe and rapheless valve showing striation pattern, axial and central areas. 309. SEM internal view of the raphe valve. 310. SEM internal view of the rapheless valve. LM scale bar = 10 μm. SEM scale bars indicated in each figure.