Diatoms of North AmericaDiatoms of North America
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Compare Eucocconeis depressa

(Cleve) Lange-Bert. in Lange-Bert. and Genkal 1999

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Although the apices of Achnanthidium exiguum are subrostrate, the valves are not arched. Eucocconeis flexella is larger and has oval-shaped valves. The central area of E. laevis is asymmetric, and the apices are broadly rounded.

LM scalebar = 10 µm
Eucocconeis4Rv Nla13 Ak03 T Eucocconeis4Prv Nla13 Ak03 T E Depressa2 Nla13 Ak21 T E Depressa11 Nla13 Ak21 T E Depressa5Prv Nla13 Ak21 T E Depressa1Prv Nla13 Ak21 T E Depressa4Rv Nla13 Ak21 T
Length Range
16.6-21.9 µm
Width Range
7.0-8.3 µm
Striae in 10 µm
28-32

Gogorevia exilis

(Kütz.) Kulikovskiy and Kociolek 2020

Gogorevia exilis LM6 Gogorevia exilis LM2 Gogorevia exilis LM4 Gogorevia exilis LM1 Gogorevia exilis LM3 Gogorevia exilis LM5 Gogorevia exilis LM5
Length Range
5-17 µm
Width Range
4.5-6.2 µm
Striae in 10 µm
24-34 in center of raphe valve, 20-25 in center of rapheless valve, up to 45 at apices

Eucocconeis flexella

(Kütz.) F.Meister 1912

Eucocconeis flexella LM1 Eucocconeis flexella LM4 Eucocconeis flexella LM5 Eucocconeis flexella LM7 Eucocconeis flexella LM3 Eucocconeis flexella LM6 Eucocconeis flexella LM2
Length Range
18-40 µm
Width Range
9-20 µm
Striae in 10 µm
22-24 in center valve

Eucocconeis laevis

(Østrup) Lange-Bert. apud Lange-Bert. and Genkal in Lange-Bert. 1999

Mo000019 Eulaev 1B Ed Gsn20110 Eulaevis 1A Ed Gsn23387 Eulaevis 1B Ed Gsn23387 Eulaevis 1A Ed Gsn20110 Eulaevis 3B Ed Gsn20110 Eulaevis 2A Ed Mo000019 Eulaev 1A Ed
Length Range
10-18 µm
Width Range
5.4-7.1 µm
Striae in 10 µm
25-35