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DIVISION
CLASS
ORDER
Coscinodiscales
FAMILY
Hemidiscaceae
GENUS
SPECIES
Actinocyclus octonarius var. tenellus, (Brébisson) Hendey , 1954
Morphological Characteristics

Cells solitary. The valves circular. Valve surface flat, divided into usually six sectors of loosely fasciculate striae. Puncta smaller as they approach the valve margin. Valve margin narrow, striae, apiculate; usually an apiculus is situated where the sectorial stria terminates on the valve margin.

 

Morphological Data
Distinctive morphometric characters
  • Cell Diameter: from 18 to 48 µm
  • Areolae in 10µm: from 8.5 to 11.5 n°
  • Marginal striae in 10 µm: from 17 to 23 n°
Distribution
In neritic plankton on all British coasts, Baltic sea.
 
Distribution:   as Actinocyclus tenellus (Brébisson) Grunow
South America: Brazil (Eskinazi-Leça et al., 2010).

as Actinocyclus ehrenbergii var. tenella (Brébisson) Hustedt
Europe: Romania (Caraus, 2002).

as Actinocyclus octonarius var. tenellus (Brébisson) Hendey
South America: Brazil (Eskinazi-Leça et al., 2010). Australia and New Zealand: New Zealand (Harper et al., 2012).

 

Notes

Toxicity:

Not reported.

Resistence Stages:

Not reported.

References

Phylum Ochrophyta: brown and golden-brown algae, diatoms, silicioflagellates, and kin., In: New Zealand inventory of biodiversity. Volume Three. Kingdoms Bacteria, Protozoa, Chromista, Plantae, Fungi. (Gordon, D.P. Eds), Christchurch: Canterbury University Press., Harper M.A., Cassie Cooper V., Chang F.H., Nelson W.A. e Broady P.A., 2012, 114-163

Algae of Romania. A distributional checklist of actual algae. Version 2.3 third revision., Bacau: Univ. Bacau., Caraus I., 2012,

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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