Neidium affine var. humerus Reimer 1959
Length:58.5

 Width:20

Striae:20

 Puncta:































Collection 1165

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Reimer 1959 (Patrick and Reimer 1966).

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This image was taken utilizing DIC for the specimen above.


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This taxon is characterized by apiculate ends, a broader valve, and has pointy ends. It sometimes has faint lines extending from the striae in the central area of the diatom. These lines are seen in other taxon of Neidium as well as this one (Patrick and Reimer 1966).


  • Type Locality
    USA, Maryland, Montgomery County, Potomac River (Patrick and Reimer 1966).
  • Synonyms
    Navicula amphigomphus Ehr. in pl. 49, fig. 32. 1877 (Patrick and Reimer 1966).


  • Ecology
    This taxon may be found in lakes and rivers (Patrick and Reimer 1966; Beaver 1981 ) and is considered to be alkaliphilous and alkalibionic (Beaver 1981 ).

    Size ranges and morphology

  • Length is 41 to 78 micrometers (Patrick and Reimer 1966).
  • Width is 14 to 22 micrometers (Patrick and Reimer 1966).
  • Striae are 20 to 22 in 10 micrometers (Patrick and Reimer 1966).
  • Puncta are around 22 in 10 micrometers (Patrick and Reimer 1966).