Compare Achnanthidium thienemannii
Compare
Achnanthidium pyrenaicum has lanceolate and asymmetrical valves.
Achnanthidium gracillimum lacks central fascia.
Achnanthidium druartii often has wider, more lanceolate valves, and lacks central fascia.
Achnanthidium minutissimum has narrower valves, radiate striae, and lacks fascia.
LM scalebar = 10 µm
Length Range
9.2-18.7 µm
9.2-18.7 µm
Width Range
3.6-4.3 µm
3.6-4.3 µm
Striae in 10 µm
20-28 in the center valve, 30-38 at the ends
20-28 in the center valve, 30-38 at the ends
Achnanthidium pyrenaicum
Length Range
10–16 µm
10–16 µm
Width Range
2.5-4.0 µm
2.5-4.0 µm
Striae in 10 µm
20-25 in the center, 34-40 at the raphe valve ends; 20-28 in the center, 32-38 at the rapheless valve ends
20-25 in the center, 34-40 at the raphe valve ends; 20-28 in the center, 32-38 at the rapheless valve ends
Achnanthidium gracillimum
Length Range
12-21 µm
12-21 µm
Width Range
3.0-3.7 µm
3.0-3.7 µm
Striae in 10 µm
21-25 in the center valve, 36-45 at the valve ends
21-25 in the center valve, 36-45 at the valve ends
Achnanthidium druartii
Length Range
14-25 µm
14-25 µm
Width Range
4.1-5.3 µm
4.1-5.3 µm
Striae in 10 µm
15-20 in 10 µm in the center valve, 40-50 in 10 µm at the ends of raphe valve, 25-35 in 10 µm at the ends of rapheless valve
15-20 in 10 µm in the center valve, 40-50 in 10 µm at the ends of raphe valve, 25-35 in 10 µm at the ends of rapheless valve
