Neidium affinevar amphirhynchus (Ehr.) Cl.
Length:69

 Width:17

Striae:20






























Collection 1788

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Authority information

Neidium affine var. amphirynchus (Ehr.) 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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The only things that differ from the taxon affine are the ends are protracted and slightly narrower (Patrick and Reimer 1966).


  • Synonyms
    Navicula amphirhynchus Ehr., Abh. Akad. Wiss. Berlin, for 1841:417, pl. 3(1), fig. 10. 1843 (Patrick and Reimer 1966).
    Neidium amphirhynchus (Ehr.) Pfitz., Bot. Abh. Geb. Morph. Physiol., 1(2):186, pl. 4. fig. 1. 1871 ( Patrick and Reimer 1966).
    Neidium iridis var. amphirhynchus (Ehr.) A. Mayer, Denkschr. Bayer. Botr. Ges. Regensburg, 13(N.F. 7):29, pl.2, fig. 34. 1917 (Patrick and Reimer 1966).


  • Ecology
    This taxon prefers a pH range of 4.0 to 9.0 and is a bottom form (Lowe 1974;Beaver 1981 ).


    Size ranges and morphology

  • Length is 30 to 45 micrometers (Patrick and Reimer 1966).
  • Width is 9 to 12 micrometers (Patrick and Reimer 1966).
  • Striae are 22 to 24 in 10 micrometers (Patrick and Reimer 1966).