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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Imprimir: 1521-9429
ISSN On-line: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v6.i4.20
pages 319-330

Morphological variability and taxonomy of Diatoma tenue Ag. (Bacillariophyta)

S. I. Genkal
I.D. Papanin Institute for Biology of Inland Waters of RAS, Settle Borok, Nekouz District, Yaroslavl Region 152742, Russia

RESUMO

Transmission electron microscopy studies of morphological variability of the valve in populations of Diatoma tenue Ag. showed that qualitative (valve shape, arrangement of axial area, striae, costae and rimoportula) as well as quantitative (valve length and width, number of costae and striae in 10 μm) characteristics vary to a great extent. Number of striae in 10 μm and valve width proved to be the most stable and valve length and number of costae in 10 μm were the most labile features. It is suggested that D. nanum var. lineare Skabitsch. be placed in synonymy with D. tenue. A detailed diagnosis of D. tenue compiled on the basis of original studies and the literature data is given.