Pinnularia acrosphaeriaW. Sm.
Length:82

 Width:12

Striae:11






























Collection 1168

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Authority information

Pinnularia acrosphaeria W.Sm., Syn. British Diat., vol. 1, p. 58, pl. 19, fig. 183. 1853 (Patrick and Reimer 1966).

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This species has linear valve, swollen in the middle portion; ends rounded, usually somewhat swollen, often almost as wide as the median portion of the valve. . Willam Smith gave the name Pinnularia acrosphaeria to this taxon. Rabenhorst, a few months later in 1853, made the combonation Pinnularia acrosphaeria for Brebisson's Frustulia acrosphaeria which is not this taxon. Dr. Willam Stearns of the British Museum has ascertained that volume one of William Smith's A Synopsis of the British Diatomaceae was published in 1853 before Rabenhorst's Die Susswasser-Diatomaceen (Bacillarien) (Patrick and Reimer 1966).


  • Type Locality
    Fresh water near Lewes, September 1850, W. Sm(Patrick and Reimer 1966).


  • Synonyms
    Pinnularia acrosphaeria var. sandvicensis A. S., Atlas Diat., pl. 43, figs. 14-15. 1876(Patrick and Reimer 1966).
    Pinnularia acrosphaeria var. minor M. Perag. & Herib. in Herib., Diat. Auvergne, p. 93. 1893(Patrick and Reimer 1966).
    Pinnularia acrosphaeria f. minor Cl., K. Svenska Vet.-Akad. Handl., Ny Foljd, 27(3):86. 1895(Patrick and Reimer 1966).


  • Ecology
    This species prefers circumneutral water of low mineral content(Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 30 to 180 micrometers (Patrick and Reimer 1966).
  • Width is 8 to 20 micrometers (Patrick and Reimer 1966).
  • Striae are 6 to 14 in 10 micrometers (Patrick and Reimer 1966).