Pinnularia intermedia (Lagerst.) Cl.
Length:24

 Width:6

 Striae:14






























Collection 1783

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Authority information

Pinnularia intermedia (Lagerst) Cl., K. Svenska Vet.-Akad. Handl., Ny Foljd 27(3):80. 1895(Patrick and Reimer 1966).

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Valve linear with slightly narrower, rounded apices. Valve slightly concave in the middle portion. Axial area narrow, becoming a little wider near the central area which is a broad, transverse fascia. Central nodule elongate. Raphe with median ends somewhat distant from each other. Striae radiate in the middle portion of the valve, convergent toward the apices(Patrick and Reimer 1966).


  • Type Locality
    Spitzbergen, Parry's Island.... (Patrick and Reimer 1966).

  • Synonyms
    Navicula intermedia Lagerst., Bih. K. Svenska Vet.-Akad. Handl., 1(14):23, pl. 1, fig. 3. 1873(Patrick and Reimer 1966).

  • Ecology
    Prefers cool water of low mineral content, in a wide pH range(Patrick and Reimer 1966; Beaver 1981).

    Size ranges and morphology

  • Length is 18 to 42 micrometers (Patrick and Reimer 1966).
  • Width is 5 to 8 micrometers (Patrick and Reimer 1966).
  • Striae are 7 to 10 in 10 micrometers (Patrick and Reimer 1966).