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Achnanthidium eutrophilum can be distinguished from A. minutissimum by its rhombic shape.

LM scalebar = 10 µm
Gs009181  Rl4 Gs009181  R46 Achnanthidium eutrophilum LM2 Achnanthidium eutrophilum LM1 Gs001021  R25 Gs001021  R20 Gs001021  R1
Length Range
5.4-17.8 µm
Width Range
2.1-4.0 µm
Striae in 10 µm
25-35 in the middle of raphe valve

Achnanthidium minutissimum

(Kütz.) Czarn. 1994

Achnanthidium minutissimum LM4 Achnanthidium minutissimum LM3 Achnanthidium minutissimum LM7 Achnanthidium minutissimum LM2 Achnanthidium minutissimum LM6 Achnanthidium minutissimum LM1 Achnanthidium minutissimum LM5
Length Range
5.6-20.8 µm
Width Range
1.5-3.3 µm
Striae in 10 µm
25-35