FIGURES 260–275 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species

FIGURES 260–275. LM and SEM images of Achnanthidium tropicocatenatum from Santa Helena reservoir, São Paulo state (SP-469524). 260–267. LM views of raphe valves. 268–273. LM views of rapheless valves. 274. SEM external view of raphe valve showing striation pattern, axial and central areas. 275. SEM external view of the rapheless valve showing striation pattern, axial and central areas. LM scale bar = 10 μm. SEM scale bars indicated in each figure.