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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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Planothidium_hood.jpg
Glossary Term
Cavum
Caption
A scanning electron micrograph of the inside of the rapheless valve of a species of
Planothidium
. The rounded, siliceous structure at the arrow is the cavum.
Credit
Marina Potapova
