Compare Halamphora latecostata
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
Length Range
16-50 µm
16-50 µm
Width Range
4.1-7.9 µm
4.1-7.9 µm
Striae in 10 µm
9-13 at dorsal center; 15-18 at dorsal apices; 19-20 ventral
9-13 at dorsal center; 15-18 at dorsal apices; 19-20 ventral
Length Range
15-40 µm
15-40 µm
Width Range
5-7 µm
5-7 µm
Striae in 10 µm
17-21 at center, 22-24 near apices
17-21 at center, 22-24 near apices
Length Range
12.7-19.3 µm
12.7-19.3 µm
Width Range
2.7-3.5 µm
2.7-3.5 µm
Striae in 10 µm
20-25
20-25
