Waterton. 1 Gomphosinica geitleri (4520) 2 Gomphonema sp. [cf. G. capitatum] (4543) 3 Gomphonema angusticephalum (4542) 4–7 Gomphonema pala (4539) 8 Gomphonema sp. (4520) [cf. Gomphonema angusticlavatum or cf. G. subclavatum (KJ)] 9 Gomphonema capitatum (4532) 10 Gomphonema subtile (4542) 11 Gomphonema brebissonii sensu lato (4543) 12, 13 Gomphonema truncatum sensu lato (4545) 14 Gomphonema anglicum (4542) 15–20 Gomphonema sp. [G. sublaticollum (KJ)] (4562, 4570). Scale bar: 10 µm.