Gomphonema vancampianum sp. nov. SEM micrographs taken from the holotype material (BR-4839, Lac du Drapeau, Sample DRAPEAU-U03VEG, France) A SEM external view of the headpole in girdle view showing the marginal crest on both valves, the larger, reniformly occluded upper areolae and the smaller, more distant areolae towards the mantle edge. Note also the slit-like pores on the girdle band B SEM external detail of the upper valve part of a valve bearing a crest showing the lowering marginal crest at the apex C SEM external view of an entire crest-bearing valve. Note the shallow depressions in the axial area D SEM external view of valve without marginal crest. Note the shallow depressions in the axial area and the valve face striae continuing over the valve face/mantle junction E SEM external detail of the central area with the depressed large areolae and the stigmoid. The shallow pit-like depressions are well visible in the axial area F SEM external detail of the footpole with the distal raphe fissure bisecting the apical pore field. Scale bars: 10 µm (A–D), 5 µm (E–F).