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Diatoms of North America
Practitioners
Morphology
Centric
Araphid
Eunotioid
Symmetric Biraphid
Monoraphid
Asymmetric Biraphid
Epithemioid
Nitzschioid
Surirelloid
Genera
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Glossary
About Us
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What are diatoms?
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annulus-lm.jpg
Glossary Term
Annulus (Geissleria)
Caption
A
Geissleria
species in valve view (LM). Arrow indicates one of the stria in this annulus.
Credit
E.F. Stoermer
