Diatoms of North AmericaDiatoms of North America
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Compare Nanofrustulum cataractarum

(Hust.) C.E.Wetzel, E.Morales and Ector 2019

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Pseudostaurosira trainorii has a similar size range and stria density. Pseudostaurosira trainorii has a narrow axial area and striae are parallel, rather than radiate.

The striae of Aulacoseira alpigena do not continue onto the valve face from the mantle. Also, A. alpigena has a wider valve mantle.

Cyclotella atomus also has a similar size range, but the striae are regularly placed around the circumference of the valve. Furthermore, central and marginal fultoportulae are present.

LM scalebar = 10 µm
Nanofrustulum cataractarum LM2 Nanofrustulum cataractarum LM4 Nanofrustulum cataractarum LM1r Nanofrustulum cataractarum LM3 Nanofrustulum cataractarum LM5
Length Range
4.3-6.3 µm
Width Range
4.1-5.6 µm
Striae in 10 µm
18-21

Pseudostaurosira trainorii

E.Morales 2001

Pseudostaurosira trainorii LM2 Pseudostaurosira trainorii LM3 Pseudostaurosira trainorii LM5 Pseudostaurosira trainorii LM1 Pseudostaurosira trainorii LM4
Length Range
2-9 µm
Width Range
1.5-4.5 µm
Striae in 10 µm
18-25

Cyclotella atomus

Hust. 1937

Cyclotella atomus LM2 Cyclotella atomus LM6 Cyclotella atomus LM7 Cyclotella atomus LM9 Cyclotella atomus LM8 Cyclotella atomus LM3
Length Range
5-7.5 µm
Striae in 10 µm
16-18

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
Length Range
4-15 µm
Width Range
4-7 µm
Striae in 10 µm
15-22