Placoneis exinguav. capitata Cox


Width :7.5


Collection 1527

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Placoneis exinguav. capitata Cox, E. J. Placoneis Mereschkowsky: The re-evalutation of a diatom genus originally characterized by its chloroplast type. Diatom Res. 2:145-157 (Cox, E. J. 1987).

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This image was taken using DIC.

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This taxon has a linear-elliptical valve with rostrate-capitate ends. The irregularly rectangular central area is large and the striae strongly radiate at the center of the valve. The striae are parallel at the ends and are finely lineate. The striae are also irreluglar in lenght at the central area (Patrick and Reimer 1966).

  • Synonyms
    Navicula exigua var. capitata Patr., Farlowia, 2(2):179, pl. 1, fig. 8. 1945 (Patrick and Reimer 1966).

  • Ecology
    This taxon prefers fresh water that is less than 100 p.p.m. hardness (Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 22 to 30 micrometers (Patrick and Reimer 1966).
  • Width is 10 to 11 micrometers (Patrick and Reimer 1966).
  • Striae are 14 to 16 in 10 micrometers (Patrick and Reimer 1966).