Neidium calvum Ostrup
Length:59

 Width:13

 Striae:18-20

Puncta:































Collection 1177

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Authority information

Oestrup 1910 (Fig. 101:2-4) (Krammer and Lange-Bertalot 1986).

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This image was taken utilizing DIC for the specimen above.


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This taxon has a straight raphe valve and a linear axial area. The central area is elliptical. The ends are bifurcate (Krammer and Lange-Bertalot 1986). This taxon is located in Lake Superior (E.F. Stoermer collection).


Size ranges and morphology

  • Length is 29 to 58 micrometers (Krammer and Lange-Bertalot 1986).
  • Width is 8 to 10 micrometers (Krammer and Lange-Bertalot 1986).
  • Striae are 16 to18 in 10 micrometers (Krammer and Lange-Bertalot 1986).
  • Puncta are around 20 to 25 in 20 micrometers (Krammer and Lange-Bertalot 1986).