Neidium bisultcatum (Lagerst.) Cl.
Length:35

 Width:7

Striae:26

Puncta:































Collection 1788

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Authority information

(Lagerst.) Cl., K. Svenska Vet.-Akad. Handl., Ny Foljd, 26(2):68. 1894 ().

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This image was taken utilizing DIC for the specimen above.


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This takon has a linear valve. The valve has parallel sides and it also has broadly rounded ends. The axial area is straight and it is narrower near the center and the ends. It also has a straight raphe valve which narrows near the ends. The central area of this taxon is diagonnally elliptical. The striae are parallel on either side of the central area and are radiate above and below it. They are also convergent on the ends (Patrick and Reimer 1966).


  • Type Locality
    uncertain, New England States, Middle Atlantic States, Southeastern States, Tennessee, Indiana, and Nebraska (Patrick and Reimer 1966).
  • Ecology
    This taxon in found in lakes and rivers. It has not been found in large quantities in the United States. It is a beta-mesosaprobe with a winter maximum and is ph indifferent (Lowe 1974 ).

    Size ranges and morphology

  • Length is 35 to 75 micrometers (Patrick and Reimer 1966).
  • Width is 7 to 12 micrometers (Patrick and Reimer 1966).
  • Striae are 26 to 30 in 10 micrometers (Patrick and Reimer 1966).
  • Puncta are around 24 to 28 in 20 micrometers (Patrick and Reimer 1966).