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Diatoms of North America
Practitioners
Morphology
Centric
Araphid
Eunotioid
Symmetric Biraphid
Monoraphid
Asymmetric Biraphid
Epithemioid
Nitzschioid
Surirelloid
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What are diatoms?
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210001_SEM1-bright.jpg
Glossary Term
Annulus (Geissleria)
Caption
Internal view of
Geissleria acceptata
(SEM). Arrow indicates an areola in this annulus. This areola has silica outgrowths around the opening.
Credit
M. Potapova
