Halamphora latecostata has a lower dorsal stria density than H. coffeaeformis, H. sabiniana, and H. acutiuscula. Halamphora latecostata is wider than H. sabiniana but narrower than H. turdiga. There is a noticeable stria density gradient from valve center to apex in H. latecostata which is absent in both H. coffeaeformis and H. turgida. Halamphora acutiuscula has a longitudinal line dorsally offset from the axial area. Halamphora subtilis is much smaller in size.

LM scalebar = 10 µm
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

Halamphora coffeaeformis

(C.Agardh) Levkov 2009

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 subtilis

Stepanek and Kociolek 2013

Halamphora subtilis LM2 Halamphora subtilis LM14 Halamphora subtilis LM13 Halamphora subtilis LM5 Halamphora subtilis LM1 Halamphora subtilis LM10 Halamphora subtilis LM17
Length Range
12.7-19.3 µm
Width Range
2.7-3.5 µm
Striae in 10 µm

Also compare to

Halamphora sabiniana

(Reimer) Levkov 2009

Halamphora turgida

(W.Greg.) Levkov 2009

Halamphora acutiuscula

(Kütz.) Levkov 2009