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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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Heterotopic.jpg
Glossary Term
Heterotopic position
Caption
Diagram of two valves of
Stephanodiscus
in girdle view. The concave valve has marginal fultoportulae (red arrow). The convex valve has central fultoportulae (black arrow).
Credit
Jeffery Stone
