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DIVISION
Ochrophyta
CLASS
Coscinodiscophyceae
ORDER
Coscinodiscales
FAMILY
Hemidiscaceae
GENUS
Actinoptychus
SPECIES
Actinoptychus octonarius, (Ehrenberg) Kützing, 1844
IMAGES
Synonyms
  • Actinocyclus octonarius: Ehrenberg (1837)
Morphological Characteristics

Solitary. In valve view the cells have a discoid shape, while in girdle view they appear rectangular. Areolation distinctly fasciculated giving the impression of the valve face being divided into "compartments." Fascicles separated by pronounced complete striae running from the margin to a more or less well developed central annulus. Fasciculation accentuated by hyaline areas filling out spaces left open by shorter rows adjacent to the complete striae. A wide marginal zone with areolae smaller than those on the valve face. Processes positioned at the end of edge rows and a large pseudonodule in the bend between valve face and mantle are readily seen with LM.
 

 

Morphological Data
Distinctive morphometric characters
  • Cell Diameter: from 50 to 300 µm
  • Areolae in 10µm: from 6 to 8 n°
  • Marginal striae in 10 µm: from 15 to 15 n°
Distribution
In the neritic plankton; cosmopolitan, common in the North Sea, Norwegian and Danish Seas, Baltic, English Channel and all Mediterranean, Atlantic and Pacific coasts, Arctic and Antarctic Oceans, Arabian, Persian Gulfs.
Notes

Toxicity:

Not reported.

Resistence Stages:

Not reported.

References

Marine Phytoplankton Atlas of Kuwait’s Waters, Kuwait Institute for Scientific Research Kuwait, Al-Kandari M., Al-Yamani F. Y., Al-Rifaie K., 2009,

Marine diatoms. In: Identifying Marine Phytoplankton., (Tomas, C.R. Eds), San Diego: Academic Press., Hasle G.R., Syvertsen E.E., 1997, 5-385

Checklist of Baltic Sea Phytoplankton Species. Baltic Sea Environment Proceedings No. 95, Helsinki Commission Baltic Marine Environment Protection Commission, Hällfors G., 2004,

SHAPE
Shape Type
simple
Shape Unit
Cell
Cod:
3 - Cylinder
Surface Area
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Volume
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