Fragilaria heidenii Ostrup 1910

Length: 23

Width: 8


Collection 1250a

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Authority information

Ostrup, Danske Diat., p. 190, pl. 5, fig. 118, 1910.

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The valves are lanceolate in shape with an expanded, well demarcated central area and a wide axial area (Stoermer and Yang 1969). The valve ends are bluntly rounded to subcapitate (Stoermer and Yang 1969). The striae are parallel to the midline of the valve (Stoermer and Yang 1969).
  • Synonyms
    Synedra inflata Heiden 1900 (Stoermer and Yang 1969)
    Fragilaria inflata (Heid.) Hustedt 1931 non Pantocsek 1902 (Stoermer and Yang 1969)
    Fragilaria longirostris Frenguelli 1941 (?) (Krammer and Lange-Bertalot (2/3) 1991)
  • Ecology
    This taxa is a littoral zone species and was only noted in inshore collections (Stoermer and Yang 1969). The valve surfaces are attached to form band-like colonies (Stoermer and Yang 1969).

    Size ranges and morphology

    The length ranges from 20-50 micrometers (Krammer and Lange-Bertalot (2/3) 1991).
    The breadth ranges from 6-10 micrometers (Krammer and Lange-Bertalot (2/3) 1991).
    The striae are 13-15 in 10 micrometers (Krammer and Lange-Bertalot (2/3) 1991).
  • In Lake Michigan samples:
    The length ranges from 22-40 micrometers (Stoermer and Yang 1969).
    The breadth ranges from 7-10 micrometers (Stoermer and Yang 1969).