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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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Caloneis_central_nodule.jpg
Glossary Term
Central nodule
Caption
Light micrograph of the central nodule in
Caloneis amphisbaena
. The thicker silica of the central nodule is distinct between the proximal raphe ends.
Credit
Gene Stoermer
