Morphological investigations of the frustule, perizonium and initial valves of the freshwater diatom Achnanthes crenulata Grunow (Bacillariophyceae)

Kensuke Toyoda, David M. Williams, Jiro Tanaka, Tamotsu Nagumo

研究成果: Article査読

18 被引用数 (Scopus)

抄録

The present study clarifies the fine structure of the vegetative frustules, initial valves and perizonium of Achnanthes crenulata Grunow. The valves of the vegetative cell are distinctly linear-lanceolate with an undulate margin. The valve face is quite flat and in girdle view is smoothly curved as in species of Gephyria (Bacillariophyceae). However, the valve face of the initial cells is slightly rounded and does not have an undulate margin. Furthermore, the rapheless sternum is centrally positioned along the apical axis of the araphid initial valve. As this taxon develops from auxospore to initial valve, it forms only longitudinal perizonial bands; no transverse bands arise. The perizonium consists of three silicified bands: one large, central longitudinal plate and two bands that underlie this plate; these two bands are either open or closed. This taxon has several conspicuous structures compared to other marine species of Achnanthes, but the structure of the perizonium supports the position of A. crenulata within Achnanthes sensu stricto.

本文言語English
ページ(範囲)173-182
ページ数10
ジャーナルPhycological Research
54
3
DOI
出版ステータスPublished - 2006 9

ASJC Scopus subject areas

  • 水圏科学
  • 農業および生物科学(その他)
  • 植物科学

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