Neidium affine var. undulatum (Grun.) Hust.
Length:35

 Width:10

Striae:22

 Puncta:































Collection 1788

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Authority information

(Grun.) Cl., K. Svenska Vet.-Akad. Handl., Ny Foljd, 26(2):68. 1894 (Patrick and Reimer 1966).

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This image was taken utilizing DIC for the specimen above.


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This taxon has a valve that has triunduylate margins. The ends are broad and subrostrate The striae are course and is larger than affine (Patrick and Reimer 1966). This taxon is found in Lake Superior (E.F. Stoermer collection).


  • Type Locality
    Wyoming (Patrick and Reimer 1966).


  • Synonyms
    Navicula affinis var. undulat Grun., Verh. Zool.-Bot. Ges. Wien, 10:544, pl. 5, fog/ 6. 1860 (Patrick and Reimer 1966).
    Neidium affine f. undulatum (Grun.) Hust. in Pasch., sussw.-Fl. Mitteleuropas, Heft 10, Aufl. 2, p.243. 1930 (Patrick and Reimer 1966).
    Neidium amphirhynchus var. undulatum (Grun.) Meist., Beitr. Kryptog.-Fl. Schweiz, 4(1), p. 107, pl. 14, fig. 18. 1912 (Patrick and Reimer 1966).


  • Ecology
    This taxon may be found in lakes (Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 55 to 80 micrometers (Patrick and Reimer 1966).
  • Width is 14 to 17 micrometers (Patrick and Reimer 1966).
  • Striae are 20 to 22 in 10 micrometers (Patrick and Reimer 1966).
  • Puncta are 20 in 10 micrometers (Patrick and Reimer 1966).