W. Smith 1851      Category: Surirelloid
TYPE SPECIES: Cymatopleura solea W. Smith




Smallest to largest - 2 taxa sorted by maximum length

Image Credit: Sarah Spaulding, Elizabeth Ruck

CLASS: Bacillariophyceae
  ORDER: Bacillariales
    FAMILY: Surirellales

  1. Frustules elliptical to panduriform
  2. Valve face undulate
  3. Raphe positioned in marginal keel

Cymatopleura cells are generally large in size, often over 200 ┬Ám in length. The valves are elliptical to panduriform. Species in Cymatopleura possess characteristic undulations on the valve face. In girdle view, Cymatopleura is distinct because of the undulating valve face. The raphe is located within a shallow keel, positioned along entire valve margin. In living cells a single plastid, composed of two plates is present. The plastid may be highly lobed and extend onto the girdle elements.

Cymatopleura is epipelic in freshwaters, and is often found in waters of high conductance and alkaline waters.

Cite This Page:
Spaulding, S., and Edlund, M. (2008). Cymatopleura. In Diatoms of the United States. Retrieved April 19, 2018, from

Contributor: Sarah Spaulding | Mark Edlund - December 2008
Reviewer: Sam Rushforth - May 2010