Staurosira sp. 3
Length: 12

 Width: 6

Striae:14






























Collection 1264

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Authority information

This variety has been reported as Fragilaria construens var. pumila Grun. (Patrick and Reimer 1966); (Stoermer and Yang1969). Based on preliminary observations and genus description of Williams and Round (1987), it may be more appropriate in the genus Staurosira . However, further investigation is necessary before the transfer can be made.


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  • This variety is distinguished by its elliptical to lanceolate shape with round to rostrate apices (Patrick and Reimer 1966). Its size range and ornamentation are similar to the nominate variety (Stoermer and Yang1969). This variety is most closely related to Staurosira construens var. venter.
  • Synonyms (Patrick and Reimer 1966)
    Fragilaria construens var. pumilaGrun. 1881.
  • Ecology
    This species is widely distributed with the nominate variety (Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 10-20 micrometers (Patrick and Reimer 1966).
  • Breadth is 3-5 micrometers (Patrick and Reimer 1966).
  • Striae range is 17-18 per 10 micrometers (Patrick and Reimer 1966).