Synedra ulna v. longissima (W. Sm.) Brun.
Length:430

 Width :6

 Striae:12






























Collection 1522

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Authority information

Synedra ulna var. longissima(W. Sm.) Brun, Diat. Alpes Jura, p. 126, pl. 4, fig. 21. 1880(Patrick and Reimer 1966).

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This image is the end of the specimen above taken in DIC.


This image is the central area for the specimen above taken in DIC.


More information


This taxon has frustules and a curved valve. The valve is linear and narrowed toward swollen rounded ends. The pseudoraphe is narrow and indistinct and there is usually no central area (Patrick and Reimer 1966).

  • Synonyms
    Synedra biceps Kutz., Bacill., p. 66, pl. 14(18); pl. 14(21), fig. 1. 1844 (Patrick and Reimer 1966).
    Synedralongissima W. Sm., Syn. British Diat., vol. 1, p. 72, pl. 12, fig. 95. 1853 (Patrick and Reimer 1966).
    Synedra ulna var.biceps (Kutz.) Schonf., Diat. Germaniae, p. 106. 1907 (Patrick and Reimer 1966).

  • Ecology
    This taxon prefers cool, fresh water (Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 200 to 600 micrometers (Patrick and Reimer 1966).
  • Width is 5 to 7 micrometers (Patrick and Reimer 1966).
  • Striae are 8 to 12 in 10 micrometers (Patrick and Reimer 1966).