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Compare Achnanthidium gracillimum

(Meister) Lange-Bert. in Krammer and Lange-Bert. 2004

Compare

Achnanthidium gracillimum differs from A. pyrenaicum, and A. latecephalum by narrowly rostrate or subcapitate apices. A. gracillimum differs from A. minutissimum by parallel striae throughout both valves, 21-25 in 10 μm at the valve center.

LM scalebar = 10 µm
Altergracillima 8 Ed Ahgrac Va000071 1B Ed Achnanthidium gracillimum LM2 Ahgrac Va000071 2A Ed Ahgrac Va000071 2B Ed Achnanthidium gracillimum LM1 Altergracillima 9 Ed
Length Range
12-21 µm
Width Range
3.0-3.7 µm
Striae in 10 µm
21-25 in the center valve, 36-45 at the valve ends

Achnanthidium latecephalum

H.Kobayasi 1997

Achn Lateceph4A Ed 1 Achn Lateceph5A Ed 1 Gss01047 Latec2B Ed 1 Achn Lateceph3 Ed 1 Achn Lateceph6B Ed Achn Lateceph2A Ed 1 Gss01047 Latec1A Ed 1
Length Range
10-16 µm
Width Range
3.5-3.9 µm
Striae in 10 µm
20-26 in the center valve, 35-40 at the ends

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

Achnanthidium pyrenaicum

(Hust.) H.Kobayasi 1997

Achnanthidium pyrenaicum LM5 Achnanthidium pyrenaicum LM3 Achnanthidium pyrenaicum LM1 Achnanthidium pyrenaicum LM4 Achnanthidium pyrenaicum LM2
Length Range
10–16 µm
Width Range
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