Diatoms of North AmericaDiatoms of North America
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Guide to Eucocconeis laevis

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

Eucocconeis Laevis Guide
  1. Frustules strongly bent
  2. Asymmetrical central area on raphe valve
  3. Central area on rapheless valve large, often asymmetrical and expanded to one or both margins
  4. Striae 25-35 in 10 μm

Frustules are often strongly bent in the girdle view. Valves are elliptical-lanceolate with slightly drawn-out ends. Raphe valve has an asymmetrical central area. Rapheless valve has a large central area of variable shape, often asymmetrical and expanded to one or both valve margins. Sometimes a shallow depression is visible on one side of the central area.