1 Cymbopleura austriaca (6957) 2 Cymbopleura lapponica (6956) 3 Cymbopleura angustata (6958) 4 Cymbopleura naviculiformis (6959) 5 Cymbopleura oblongata (6956) 6 Cymbopleura incerta (6956) 7 Cymbopleura subaequalis (6958) 8, 9 Cymbella excisiformis (6958) 10, 11 Cymbella alpestris (6957) 12–15 Cymbella neocistula (6956, 6957) 16 Cymbella cosleyi (6956) 17 Cymbella cleve-eulerae (6956) 18Cymbella neocistula var. islandica (6956). Scale bar: 10 µm.