Edlund, M.,
Burge, D.
(2015).
Pleurosigma.
In Diatoms of North America.
Retrieved November 17, 2024, from https://diatoms.org/genera/pleurosigma
Symmetric Biraphid
Pleurosigma
Valves sigmoid
Raphe sigmoid
Striae decussate
Valves are elongate and sigmoid. Striae are composed of evenly spaced decussate rows. The rows are arranged in 3 patterns: a trans-apical row and two opposing oblique rows. Internally, the areolae are occluded by hymenes. The raphe is strongly sigmoid, with a narrow axial area. The sternum is thickened equally on both sides. The raphe...