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Actinocyclus normanii is a centric diatom with disc-shaped valves, coarse areolae and rimoportulae. It is widespread and common in coastal, brackish and planktonic habitats, and may reflect nutrient enrichment and human alteration.
Actinocyclus normanii is a microalga, a species of planktonic centric diatom. It is a marine species that is also found in brackish and eutrophic fresh water. It is considered an invasive species in the United States . Description. Actinocyclus normanii is cylindrical with two valves or frustules.
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La diatomea Actinocyclus normanii exhibe cierta grado de halotolerancia, aunque su crecimiento disminuye drásticamente con el incremento de la salinidad; se considera una especie bioindicadora de aguas de baja salinidad y ricas en silicato.
Actinocyclus normanii is a species of diatom in the family Hemidiscaceae, with a marine, brackish or freshwater habitat. It was originally described by Greville in 1859 and has one documented form and 10 distribution records.
Actinocyclus normanii cells from BL205 to BL165 samples have diameters above the limit of 40 µm, which indicates that a transgression was already affecting the lagoon by 1,870 years BP (Van der Hammen & Noldus, 1984; Vélez, et al., 2014).
Return to overview. Guide to Actinocyclus normanii. (W.Greg. ex Grev.) Hust. 1957. Credit: Mark Edlund. Areolae radiate in pseudosectors. Areolae similar in size across valve. Rimoportulae marginal. Valves concentrically undulate, with radiate areolae. Areolae are 8-12 in 10 µm and maintain constant size throughout the valve.
