Diatoms of North AmericaDiatoms of North America
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Compare Aulacoseira valida

(Grunow in Van Heurck) Krammer 1991

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Aulacoseira valida is sometimes confused with large specimens of A. ambigua. Aulacoseira ambigua has spines at the end of each pervalvar costa. Linking spines are short, triangular or bifurcated.

Aulacoseira italica has mantle areolae that are almost straight or slightly curved. The rows of areolae are either parallel to the pervalvar axis or inclined to the left .

LM scalebar = 10 µm
Aulacoseira valida LM2 Aulacoseira valida LM3 Aulacoseira valida LM4 Aulacoseira valida LM5 Aulacoseira valida LM6 Aulacoseira valida LM1
Diameter
7-16 µm
Width Range
10-16 µm
Striae in 10 µm
12-17

Aulacoseira ambigua

(Grunow) Simonsen 1979

Aulacoseira ambigua LM5 Aulacoseira ambigua LM6 Aulacoseira ambigua LM3 Aulacoseira ambigua LM4 Aulacoseira ambigua LM7 Aulacoseira ambigua LM1 Aulacoseira ambigua LM2
Diameter
3-12 µm
Width Range
5-15 µm
Striae in 10 µm
17-22

Aulacoseira italica

(Ehrenb.) Simonsen 1979

Aulacoseira italica LM2 Aulacoseira italica LM1 Aulacoseira italica LM4 Aulacoseira italica LM3 Aulacoseira italica LM4 Aulacoseira italica LM6
Diameter
4-24 µm
Width Range
9-20 µm
Striae in 10 µm
17-25