Diatoms of North AmericaDiatoms of North America

GS020021_19.jpg

  • Glossary Term
    Porca | Keel
  • Caption
    External surface of Surirella amphioxys (SEM). The raised portion of the undulation is a porca. The raised canal (keel) containing the raphe is at the top of the image.
  • Credit
    Marina Potapova
Gs020021 19

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