FIGURES 41–49 in Achnanthidium guarulhense sp. nov. (Achnanthidiaceae, Bacillariophyta), a new diatom species from a Conservation Unit in Southeast Brazil

FIGURES 41–49. SEM images of Achnanthidium guarulhense sp. nov. of the (UPCB 105117) holotype slide from Negro Lake, Guarulhos, state of São Paulo. 41. SEM external view of raphe valve showing striation pattern, and axial and central areas. 42–44. SEM internal view of the raphe valve. 44. Note the detail of areolae occlusions. 45–46. SEM external view of the rapheless valve. 47. SEM internal view of the rapheless valve. 48–49. SEM showing the girdle view. SEM scale bar = 3 μm; 44 =1 μm; 46, 49 = 4 μm.