Diatoms of North AmericaDiatoms of North America

Glossary

Like the rest of this website, the glossary is a work in progress. If we’ve missed a term, please contact us to let us know the term and references.

Sigmoid

Sigmoid refers to an object which resembles the shape of the letter S.

Citations

Gyrosigma Iconic 500X500
Image Credit: Sarah Spaulding, Mark Edlund
This valve of Gyrosigma has a sigmoid outline and raphe.
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