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Compare Aulacoseira nivaloides

(Camburn) English and Potapova 2009

Compare

Aulacoseira nivaloides, when observed in the valve view, can be confused with A. pusilla, A. nivalis and A. tenella. All of these taxa possess areolae on the valve face, but A. nivaloides differs by a strongly convex or concave valve face. Valve face areolae are much larger in A. nivalis and rather faint in A. pusilla. The spines are much shorter in A. tenella than in A. nivaloides. In girdle view, A. nivaloides is similar to A. nygardii, which has, however, a flat plain valve face and, usually, a higher row density of mantle areolae. The rows of mantle areolae in A. pusilla and A. alpigena are usually curved, while they are straight in A. nivaloides.

LM scalebar = 10 µm
Aulacoseira nivaloides LM3 Aulacoseira nivaloides LM2 Aulacoseira nivaloides LM6 Aulacoseira nivaloides LM7 Aulacoseira nivaloides LM1 Aulacoseira nivaloides LM5 Aulacoseira nivaloides LM4
Diameter
4-11 µm
Width Range
4-7 µm
Striae in 10 µm
14-22

Aulacoseira nygaardii

(Camburn) Camburn and Charles 2000

Aulacoseira nygaardii LM1 Aulacoseira nygaardii LM2 Aulacoseira nygaardii LM4 Aulacoseira nygaardii LM5 Aulacoseira nygaardii LM3 Aulacoseira nygaardii LM6 Aulacoseira nygaardii LM7
Diameter
4-11 µm
Width Range
4-19 µm
Striae in 10 µm
22-31

Aulacoseira pusilla

(Meister) Tuji and Houki 2004

Aulacoseira pusilla LM3 Aulacoseira pusilla LM4 Aulacoseira pusilla LM5 Aulacoseira pusilla LM6 Aulacoseira pusilla LM1 Aulacoseira pusilla LM2
Diameter
4.5-7.5 µm
Width Range
2.2-4.5 µm
Striae in 10 µm
24-26

Aulacoseira nivalis

(W.Sm.) English and Potapova 2009

Aulacoseira nivalis LM2 Aulacoseira nivalis LM1 Aulacoseira nivalis LM3 Aulacoseira nivalis LM6 Aulacoseira nivalis LM5 Aulacoseira nivalis LM4 Aulacoseira nivalis LM7
Diameter
6-18 µm
Width Range
2.5-6 µm
Striae in 10 µm
12-16

Aulacoseira tenella

(Nygaard) Simonsen 1979

Gsn97387 1B Gsn97387 1A Gsn97387 5A Gsn97387 3A Gsn97387 3B Gs024173 1A Gs024173 1B
Diameter
5-8.5 µm
Width Range
1.8-2.6 µm
Striae in 10 µm
21-25

Aulacoseira alpigena

(Grunow) Krammer 1991

Aulacoseira alpigena LM2 Aulacoseira alpigena LM1 Aulacoseira alpigena LM4 Aulacoseira alpigena LM3 Aulacoseira alpigena LM5 Aulacoseira alpigena LM6 Aulacoseira alpigena LM7
Diameter
4-15 µm
Width Range
4-7 µm
Striae in 10 µm
15-22