Compare

Halamphora acutiuscula and H. tumida both have a lower stria density.

LM scalebar = 10 µm
Halamphora coffeaeformis LM3 Halamphora coffeaeformis LM6 Halamphora coffeaeformis LM1 Halamphora coffeaeformis LM5 Halamphora coffeaeformis LM7 Halamphora coffeaeformis LM4 Halamphora coffeaeformis LM2
Length Range
15-40 µm
Width Range
5-7 µm
Striae in 10 µm
17-21 at center, 22-24 near apices

Halamphora latecostata

Štěpánek and Kociolek 2013

Halamphora latecostata LM1 Halamphora latecostata LM6 Halamphora latecostata LM5 Halamphora latecostata LM7 Halamphora latecostata LM2 Halamphora latecostata LM3 Halamphora latecostata LM4
Length Range
16-50 µm
Width Range
4.1-7.9 µm
Striae in 10 µm
9-13 at dorsal center; 15-18 at dorsal apices; 19-20 ventral

Also compare to

Halamphora tumida

(Hust.) Levkov

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