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DIVISION
CLASS
ORDER
Thalassiosirales
FAMILY
Stephanodiscaceae
GENUS
SPECIES
Cyclotella radiosa, (Grunow) Lemmermann, 1900
Synonyms
  • Puncticulata radiosa: Grunow, H.Hakansson (2002)
  • Lindavia radiosa: Grunow, Forti (1900), De Toni
  • Cyclotella comta var. radiosa : Grunow (1882)
Morphological Characteristics

Cells single or loosely connected to chain. Valves circular, have a concentric undulation. The central area radially punctuated, in the centre often several irregularly arranged points surrounded by a hyaline ring. The valve is edge quite wide, evenly striped. Every third to forth (fifth) radial stripe is thickened. Shadow line is visible.

 

Morphological Data
Distinctive morphometric characters
  • Striae in 10 µm: from 13 to 16 n°
  • Cell Diameter: from 8 to 50 µm
Distribution

 

Freshwater environments.

Distribution:  Europe: Finland (Weckstrom & Juggins, 2006), Germany (Beszteri et al 2007), Iceland (Ettl & Gärtner, 1995), Luxembourg (Beszteri et al, 2007), Romania (Caraus, 2002), Spain (Ros, Marín-Murcia & Aboal, 2009), Turkey (Ersanli & Gönülol, 2006); North America: Ohio (Weber, 1970), Utah (Ettl & Gärtner, 1995); South America: Argentina (Rodriguez et al. 2006); in South-west Asia: Iran (Afsharzadeh et al., 2003); Asia: China (Hu and Wei, 2006); in the Pacific Ocean: Hawaiian Islands (Sherwood, 2004).

Notes

Toxicity:

Not reported.

Resistence Stages:

Not reported.

References

The algae of Romania., Studii si Cercetari, Universitatea Bacau, Biologie 7, Caraus I., 2002, 1-694

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

Süßwasserflora von Mitteleuropa, Bd. 02/3: Bacillariophyceae Teil 3: Centrales, Fragilariaceae, Eunotiaceae, Gustav Fisher Verlag: Stuttgard, Krammer K., Lange-Bertalot H., 1991,

Biovolumes and size-classes of phytoplankton in the Baltic Sea, HELCOM Balt.Sea Environ. Proc. No. 106, Olenina I., Hajdu S., Edler L., Andersson A., Wasmund N., Busch S., Göbel J., Gromisz S., Huseby S., Huttunen M., Jaanus A., Kokkonen P., Ledaine I. and Niemkiewicz E., 2006, 1-144

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