Synedrosphenia licmophoropsis sp. nov. A apical pole of living cell showing plastids and annulus (arrow) (GU44AV-8) B–D holotype valve from GU55B-4 in LM: apical and basal portions showing annulus and entire valve E, F external view of valve, SEM: basal and apical poles, respectively, same scale (GU44Y-13) G, H apical and basal poles, respectively, valve in internal view, SEM, showing longitudinal and transverse costae and pseudosepta (arrows) (GU56A-2). Scale bars: 50 µm (D); 10 µm (A–C, E–G); 5 µm (H).