Ardissoneopsis appressata sp. nov., cont. GU44BJ-4 except as noted A girdle view of part of colony showing cells joined valve to valve, and the pattern of pores in valvocopula (VC) and copula (cop) (GU44AE-2) B, C valve pole in external and internal view, respectively showing tip of annulus (arrows) D portion of copula showing fimbriae E portion of valve near center: arrow points along longitudinal thickening below annulus and arrowhead indicates narrowing of transverse costae at margin F portion of frustule in narrow part, showing internal and external aspects and portions of the fimbriate valvocopulae (GU44T-1). Scale bars: 5 µm (A–C, E, F); 2 µm (D).