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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
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What are diatoms?
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Rhopalodia_guide_SEM_no_arrow.jpg
Glossary Term
Costa
Caption
Scanning electron micrograph of ventral side of a frustule of
Rhopalodia
. The costae appear as ridges on the valve surface.
Credit
Ditmar Metzeltin, Marina Potapova, Pat Kociolek
