Waterton. 1, 2 Delicata delicatula (4534) 3 Halamphora coraensis (4543) 4, 5 Amphora copulata (4542, 4562) 6 Amphora sp. (4543) 7 Amphora pediculus (4562) 8 Amphora thumensis (4545) 9 Cymbella neoleptoceros (4542) 10 Cymbella stigmaphora (4534) 11–15 Cymbella excisiformis (4546). Valves in this population have two stigmata 16Cymbella neocistula var. islandica (4520) 17 Cymbella proxima (4520) 18 Cymbella neocistula (4534) 19 Cymbella alpestris (4541) 20, 21 Cymbella hantzschiana (4534) 22 Cymbella cosleyi (4520). Scale bars: 10 µm.