Morphological variability of the diatom Cyclotella atomus Hustedt var. atomus and C. atomus var. gracilis var. nov.

S. I. Genkal, K. T. Kiss

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Cyclotella atomus collected from different rivers, reservoirs and lakes shows considerable morphological variability. On the basis of electronmicroscopic (EM) study, we propose Cyclotella atomus var. gracilis Genkal et Kiss as a new variety of this species. Cyclotella atomus var. atomus has short and long radial striae, which are irregularly arranged on the same valve, and the alveolar chambers are not clearly divided from the central, hyaline part of the valve face. In addition to the described basic form, several specimens with other features have also been found and are thought to belong to an undescribed variety. The striae of the new variety are equal in length, and the alveolar chambers are clearly divided from the hyaline central area of the valve face by a curved structure. There are EM micrographs on Cyclotella atomus var. gracilis under different names in different papers. The new variety has several characteristics also found in other species, e.g. Cyclotella caspia Grun., or C. meneghiniana Kütz.

Original languageEnglish
Pages (from-to)39-47
Number of pages9
JournalHydrobiologia
Volume269-270
Issue number1
DOIs
Publication statusPublished - Oct 1 1993

Keywords

  • Bacillariophyceae
  • Centrales
  • Cyclotella atomus
  • EM morphology
  • taxonomy

ASJC Scopus subject areas

  • Aquatic Science

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