Diatoms of North AmericaDiatoms of North America
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Guide to Cyclotella atomus

Hust. 1937

Cyclotella Atomus Guide
  1. Off-center fultoportula
  2. Marginal fultoportulae every 4th-5th costa
  3. Valve surface flat

This taxon is a small diatom with marginal striae and a fultoportula near the valve center. The fultoportula appears as a dark spot. Marginal fultoportulae are present every 4th-5th costa.