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Guide to Pleurosigma delicatulum

W.Sm. 1852

Pleurosigma delicatulum guide
  1. Valves large
  2. Valves sigmoid
  3. Raphe central, eccentric near apices
  4. Apices acute

Valves are large, sigmoid, and lightly silicified. Apices are acute. The raphe is central, becoming slightly eccentric near the apices. Striae form a decussate pattern.

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