Hannaea arcus (Ehr.) Patr. comb. nov. 1966
Length: 182

 Width: 5

 Striae: 15






























Collection 1161

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Authority information

(Ehr.) Patrick in: Patrick and Reimer, Acad. Nat. Sci. Philadelphia Monogr., 13: 132, pl. 4, fig. 20. 1966 (Stoermer and Yang 1969).

Other images


This is the central area of the specimen.


This is a colorized version of the specimen.

More information


  • Typically, this taxon is found in springs and streams (Lowe 1974).


  • Synonyms (Stoermer and Yang 1969)
    Navicula arcus Ehrenberg, Infusionsthierchen, p. 182, pl. 21, fig. 10. 1838.
  • Ecology
    This taxon prefers cool, flowing water (Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 15 to 150 micrometers (Patrick and Reimer 1966).
  • Width is 4 to 7 micrometers (Patrick and Reimer 1966).
  • Striae are 13 to 14 per 10 micrometers in the center of the valve; they become finer at the ends of the valve with 18 striae in 10 micrometers (Patrick and Reimer 1966).