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Diatoms of North America
Practitioners
Morphology
Centric
Araphid
Eunotioid
Symmetric Biraphid
Monoraphid
Asymmetric Biraphid
Epithemioid
Nitzschioid
Surirelloid
Genera
Species
Glossary
About Us
News
Projects
Review Board
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What are diatoms?
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Gyrosigma_iconic-500x500.jpg
Glossary Term
Sigmoid
Caption
This valve of
Gyrosigma
has a sigmoid outline and raphe.
Credit
Sarah Spaulding, Mark Edlund
