Surirella biseriata var. bifrons (Ehr.) Hust.
Length: 102

 Width: 39

 Wing canal:20 ribs in 100






























Collection 1056a

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Authority information

Surirella biseriata var. bifrons (Ehrenberg 1833, Ehrenberg 1838) Hustedt 1911, p. 305; Hustedt 1914, p. 123. (VanLandingham 1978).

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The valve ends are isopolar to slightly heteropolar. The wing projection is clearly visible. The gurdle view is rectangular or trapazoidal with cuneate and rounded ends. (Krammer and Lange-Bertalot 1988).



Ecological distribution


Found in lakes, ponds, springs/ streams, pools, and thermal springs. pH: Acidophilous, indifferent, alkailphilous, alkalibiontic. (Beaver 1981).


Synonyms

    Navicula bifrons Ehrenberg 1833, p. 259; Ehrenberg 1836, p. 53; Ehrenberg 1838, p. 186, 14/2
    Surirella bifrons Ehrenberg 1841 (1843), p. 388, 3/5, fig. 5; 4/3, fig. 1
    Surirella bifrons var. intermedia Otto Muller 1904, pg. 27, 1/1; Otto Muller 1904 in Schmidt et al. 1874 -__, 245/8
    Surirella bifrons var. tumida Otto Muller 1904, pg. 27, 1/2; Otto Muller 1904 in Schmidt et al. 1874 -__, 245/9
    Surirella bifrons var. tumida f. minor Otto Muller 1904, pg. 27, 1/3; Otto Muller 1904 in Schmidt et al. 1874 -__, 245/10
    Sur1rella bifrons var. ? Schmidt 1875 in Schmidt et al. 1874-__, 22/5
    Surirella sp. Schmidt 1875 in Schmidt et al. 1874-__, 22/6
    Surirella biseriata var. bifrons f. typicaMayer 1916 (1917), p. 65
    Surirella biseriata var. bifrons f. tumida (Otto Muller 1904) Mayer 1918, p128, (4/3)
    Surirella brunhesi Heribaud 1908, p. 29, 14/12
    Surirella biseriataf. tumida (Otto Muller 1904) Mayer 1918, 4/3; Cleve-Euler 1952, p. 106, fig. 1528 B r
    Surirella biseriata f. intermedia (Otto Muller 1904) Hustedt 1911, p. 305
    Surirella bifronsf. minor (Otto Muller 1904), Hustedt,1911 p. 304
    (VanLandingham 1978)

Size ranges and morphology

  • Length is 76 to 150 micrometers (Krammer and Lange-Bertalot 1988).
  • Width is 30 to 60 micrometers (Krammer and Lange-Bertalot 1988).
  • Wing canal has 12 to 22 ribs in 100 micrometers (Krammer and Lange-Bertalot 1988).

    * Note, In Krammer and Lange-Bertalot This species is listed as S. bifrons, a synonym of S. biseriata v. bifrons