Compare Achnanthidium atomus
Achnanthidium atomus is distinguished from other species in Achnanthidium by its small size, linear-elliptical shape, and characteristic striae pattern, which differs between the raphe and rapheless valve. Achnanthidium atomus differs from A. minutissimum by the absence of drawn-out valve apices and by the parallel striae on the rapheless valve.
LM scalebar = 10 µm
Length Range
9.9-21 µm
9.9-21 µm
Width Range
3-3.5 µm
3-3.5 µm
Striae in 10 µm
28-30 in raphe valve, 22-25 in rapheless valve
28-30 in raphe valve, 22-25 in rapheless valve
Length Range
5.6-20.8 µm
5.6-20.8 µm
Width Range
1.5-3.3 µm
1.5-3.3 µm
Striae in 10 µm
25-35
25-35
