Diatoms of North AmericaDiatoms of North America
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Compare Aulacoseira islandica

(O.Müll.) Simonsen 1979

Compare

In addition to A. islandica, a number of Aulacoseira species have straight rows of mantle areolae (A. granulata A. canadensis, and A. crassipunctata). Aulacoseira granulata has coarser areolae and characteristic spines. Both A. canadensis and A. crassipunctata are even more coarse in valve and areolae. Aulacosira nivalis has shorter mantle height than A. islandica.

LM scalebar = 10 µm
Aulacoseira islandica LM5 Aulacoseira islandica LM1 Aulacoseira islandica LM7 Aulacoseira islandica LM6 Aulacoseira islandica LM4 Aulacoseira islandica LM3 Aulacoseira islandica LM2
Diameter
5.5-20.4 µm
Width Range
8.9-18.3 µm
Striae in 10 µm
12-14

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 canadensis

(Hust.) Simonsen 1979

Aulacoseira canadensis LM1 Aulacoseira canadensis LM6 Aulacoseira canadensis LM2 Aulacoseira canadensis LM3 Aulacoseira canadensis LM4 Aulacoseira canadensis LM5 Aulacoseira canadensis LM7
Diameter
5-16 µm
Width Range
13-22 µm
Striae in 10 µm
6-11

Aulacoseira crassipunctata

Krammer 1991

Aulacoseira crassipunctata LM6 Aulacoseira crassipunctata LM5 Aulacoseira crassipunctata LM3 Aulacoseira crassipunctata LM4 Aulacoseira crassipunctata LM1 Aulacoseira crassipunctata LM2
Diameter
4-12 µm
Width Range
9-18 µm
Striae in 10 µm
5.5-9

Aulacoseira granulata

(Ehrenb.) Simonsen 1979

Aulacoseira granulata LM1 Aulacoseira granulata LM2 Aulacoseira granulata LM3 Aulacoseira granulata LM4 Aulacoseira granulata LM5 Aulacoseira granulata LM6
Diameter
4-17 µm
Width Range
4-20 µm
Striae in 10 µm
8-18

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