Neidium dubium var. 1
Length:35

 Width:13.5

Striae:20

 Puncta:































Collection 1175

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This image was taken utilizing DIC for the specimen above.


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This species is a variety of dubium. It is only slightly different from dubium. (Patrick and Reimer 1966). It closely follows dubium so the following information is from the genera dubium. The taxon usually has tapered sides and the valve is linear. The ends of the raphe valves are straight and the distal ends are for the most part indistinct. The striae for this taxon is radiate to parallel. It is best distinguished by the straight proximal ends of the raphe valve along with the shallow punta and the striae (Patrick and Reimer 1966).


  • Type Locality (Patrick and Reimer 1966)
    South America, Surinam, New England States, Massachusetts, Southeastern States, Eastern Central States, Lakes States, Plains States, Oregon, and California

  • Ecology
    This taxon may be found in lakes, streams, ponds, rivers, lagoons, pools, and swamps(Patrick and Reimer 1966; Beaver 1981 ) and is considered to be ph indifferent as well as oligosaprobic. (Beaver 1981 ).

    Size ranges and morphology

  • Length is 30 to 50 micrometers (Patrick and Reimer 1966).
  • Width is 10 to 16 micrometers (Patrick and Reimer 1966).
  • Striae are 18 to 20 in 10 micrometers (Patrick and Reimer 1966).
  • Puncta are around 20 in 10 micrometers (Patrick and Reimer 1966).