Diatoms of North AmericaDiatoms of North America
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Guide to Gyrosigma nodiferum

(Grunow) Reimer 1966

Gyrosigma nodiferum guide
  1. Valves moderately sigmoid
  2. Valves 11-12 µm wide
  3. Central area asymmetric
  4. Central area unornamented
  5. Raphe with double curvature

Valves are moderately sigmoid. Valves are 11-12 µm wide. The central area is asymmetric and rectangular to irregularly shaped. The central area is unornamented. The raphe has a double curvature.