Baillie-Back. 1 Kobayasiella okadae (6857) 2 Kobayasiella micropunctata (6859) 3–5 Kobayasiella jaagii [K. jaagii sensu lato PH] (6857) 6 Navicula subconcentrica [cf. N. cryptocephala sensu lato PH] (6858) 7 Navicula cryptocephala [cf. N. cryptocephala PH] (6856) 8, 9 Navicula notha (6857) 10 Navicula vulpina (6857) 11, 12Navicula tripunctata var. arctica (6857) 13 Navicula venerablis (6862) 14–17 Navicula exilis (6856, 6857). Scale bar: 10 µm.