Diatoms of North AmericaDiatoms of North America
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Compare Achnanthes coarctata

(Bréb. ex W.Sm.) Grunow in Cleve and Grunow 1880

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Achnanthes coarctata has a central constriction, while A. inflata has a central inflation of the valve margin.

LM scalebar = 10 µm
Achnanthes coarctata LM4 Achnanthes coarctata LM2 Achnanthes coarctata LM1 Achnanthes coarctata LM5 Achnanthes coarctata LM3
Length Range
32-70 µm
Width Range
9.4-15 µm
Striae in 10 µm
11 on the raphe valve, 9-10 on the rapheless valve

Achnanthes inflata

(Kütz.) Grunow 1867

Achnanthes inflata LM7 Achnanthes inflata LM1 Achnanthes inflata LM2 Achnanthes inflata LM3 Achnanthes inflata LM4 Achnanthes inflata LM5 Achnanthes inflata LM6
Length Range
32-59 µm
Width Range
13.5–21.1 µm
Striae in 10 µm
11