Compare Achnanthidium rosenstockii
Compare
Achanthidium reimeri has a larger central area on the raphe valve, an elliptic central area on the rapheless valve, and striae that become more dense near the apices.
Psammothidium didymum has a central constriction and rounded apices.
LM scalebar = 10 µm
Length Range
9.6-11.4 µm
9.6-11.4 µm
Width Range
3.4-4.1 µm
3.4-4.1 µm
Striae in 10 µm
24-26 in the center valve, 26-28 at the ends.
24-26 in the center valve, 26-28 at the ends.
Achnanthidium reimeri
Length Range
11.5-18.2 µm
11.5-18.2 µm
Width Range
3.5-4.5 µm
3.5-4.5 µm
Striae in 10 µm
26-29 in the center valve
26-29 in the center valve
Psammothidium didymum
Length Range
6-9 µm
6-9 µm
Width Range
3.3-4.2 µm
3.3-4.2 µm
Striae in 10 µm
28-32 on raphe valve, 25-28 on rapheless valve
28-32 on raphe valve, 25-28 on rapheless valve