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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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What are diatoms?
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25_e-publ_copy.jpg
Glossary Term
Porca
Caption
External surface of a species of
Surirella
(SEM). A porca is outlined in white. Two porcae are visible in the image.
Credit
Jana Veselá
