Waterton. 1–4Karayevia clevei var. bottnica (4545) 5 Eucocconeis alpestris (4533) 6, 7 Achnanthidium sp. (4546, 4547) 8, 9 Platessa conspicua (4539) 10, 11 Rossithidium pusillum (4520) 12 Cocconeis pseudothumensis (4545) 13 Diadesmis perpusilla (4520) 14 Brachysira microcephala (4520) 15, 16 Psammothidium sp. [cf. P. daonense PH] (4569) 17, 18 Psammothidium curtissimum [P. saccula PH] (4520) 19 Geissleria (?) sp. (4520) 20, 21 Geissleria similis (4520, 4570) 22, 23 Geissleria paludosa (4520, 4542) 24–26 Mastogloia grevillei (4533) 27 Reimeria sp. [R. sinuata PH] (4520) 28–30 Cavinula davisiae (4562) 31, 32 Diatomella balfouriana (4562) 33 Luticola mutica (4561). Scale bars: 10 µm.