, Volume 60, Issue 1, pp 141–149 | Cite as

Fine structure of an unusual cytoplasmic inclusion in the diatom genus,Rhopalodia

  • Ryan W. Drum
  • Stuart Pankratz


  1. 1.

    Ellipsoidal to ovoid inclusions in the diatomsRhopalodia gibba andR. gibberula were examined in the electron microscope.

  2. 2.

    The inclusions are 4 to 6 microns wide, 5 to 7 microns long and separated from the diatom cytoplasm by a five-layered wall.

  3. 3.

    Lamellae about 16 mμ wide and 25 mμ apart occur near the periphery, with oil droplets and aggregations of 18 to 22 mμ particles occurring between them.

  4. 4.

    They are neither pyrenoids nor oil bodies.

  5. 5.

    They may be unique cell organelles whose function is unknown or possibly modified coccoid blue-green algae.

  6. 6.

    The cytoplasm of the two species ofRhopalodia resembles that of other diatoms.



Electron Microscope Fine Structure Cell Organelle Cytoplasmic Inclusion Unique Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1965

Authors and Affiliations

  • Ryan W. Drum
    • 1
  • Stuart Pankratz
    • 1
  1. 1.Department of Botany and Plant PathologyIowa State UniversityAmes

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