Halamphora normanii is distinguished from H. montana by its visible dorsal and ventral striae, and from H. pseudomontana by its lower striae count, less dramatically deflected proximal raphe ends, and distinct dorsal fascia.

LM scalebar = 10 µm
Halamphora normanii LM1 Halamphora normanii LM3 Halamphora normanii LM4 Halamphora normanii LM5 Halamphora normanii LM2
Length Range
20-30 µm
Width Range
4.3-5 µm
Striae in 10 µm

Halamphora montana

(Krasske) Levkov 2009

Halamphora montana LM1 Halamphora montana LM4 Halamphora montana LM5 Halamphora montana LM3 Halamphora montana LM6 Halamphora montana LM2
Length Range
12-20 µm
Width Range
3-4.5 µm
Striae in 10 µm
Difficult to resolve in LM

Also compare to

Halamphora pseudomontana

(Cholnoky) Levkov 2009