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Scale bar for all figures in Fig. 20 = 10 Ám.

FIGS 12 & 13 Navicula cruciculavar. cruciculoides
FIG. 12. High focus. FIG. 13. Focus on pseudosepta.

FIG. 14. Navicula platystoma

FIG. 15. Diadesmis perpusilla

FIG. 16. Geissleria ignota

FIG. 17. Aneumastus apiculatus

FIG. 18. Caloneis dorogostaiskyi

FIG. 19. Haslea spicula

FIG. 20. Frustulia spicula

FIG. 21. Berkeleya rutilans

FIG. 22. Oestrupia zachariasii

FIG. 23. Neidiopsis vekhovii

FIG. 24. Brachysira julio

FIG. 25. Brachysira aponina

FIGS 26 & 27 Mastogloia pumila
FIG. 26. High focus. FIG. 27. Mid-focus.

FIGS 28 & 29 Mastogloia baltica
FIG. 28. High focus. FIG. 29. Mid-focus.

FIGS 30 & 31 Mastogloia ellipticavar. dansei
FIG. 30. High focus. FIG. 31. Mid-focus.