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Eucocconeis laevis differs from E. americana by smaller valves, which are also arched and have rounded apices. The central area on the raphe valve is symmetric in E. americana, but usually asymmetric in E. laevis.

LM scalebar = 10 µm
Eucocconeis americana LM1 Eucocconeis americana LM5 Eucocconeis americana LM3 Eucocconeis americana LM4 Holotype 1A Crp Holotype 1D Crp Eucocconeis americana LM2
Length Range
14.8–39.7 µm
Width Range
7.8–13.4 µm
Striae in 10 µm
22–32

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