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DIVISION
Ochrophyta
CLASS
Coscinodiscophyceae
ORDER
Coscinodiscales
FAMILY
Hemidiscaceae
GENUS
Actinocyclus
SPECIES
Actinocyclus octonarius var. crassus, (W.Smith) Hendey , 1954
Synonyms
  • Eupodiscus crassus W.Smith 1853: W. Smith
Morphological Characteristics

The valves are circular, less undulate than the type species. Central area large and filled with coarse puncta arranged in irregularly radiatining lines, or scattered. Marginal zone stronger and more clearly developed than in the type; often occupying up to 1/3rd radius. The pseudonodule  is small, but clearly seen, usually well removed from the valve margin to about 1/5th radius. Marginal rim strongly striae. Radial structure on the valve generally less evident.

 

Morphological Data
Distinctive morphometric characters
  • Cell Diameter: from 20 to 52 µm
Distribution
Planktonic in the neritic zone. Common around all British coasts, Persian Gulf, Baltic Sea.

 

Distribution:  Europe: Finland (Weckstrom & Juggins, 2006). South America: Brazil (Eskinazi-Leça et al., 2010).

 

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,

Coastal diatom-environment relationships from the Gulf of Finland, Baltic Sea ., Journal of Phycology 42:, Weckstrom K., Juggins S., 2006, 21-35.

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

Bacillariophyceae. In: Catálogo de plantas e fungos do Brasil., Rio de Janeiro: Andrea Jakobsson Estúdio; Instituto de Pesquisas Jardim Botânico do Rio de Janeiro. Vol. 1. (Forzza, R.C. Eds), Eskinazi-Leça E., Gonçalves da Silva Cunha M. da G., Santiago M.F., Palmeira Borges G.C., Cabral de Lima J.M., Da Silva M.H., De Paula Lima J., Menezes, M., 2010, 262-309

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