Neidium iridis (Ehr.) Cleve
Length:40.5

 Width:16

Striae:17

 Puncta:































Collection 1426

 Other images

 More information



Return to Top Page Return to Genera List Return to Species List

Authority information

(Ehr.) Cleve, K. Svenska Vet.-Akad. Handl., Ny Foljd, 26(2):69. 1894 (Stoermer and Yang 1969).

Other images



This image was taken utilizing DIC for the specimen above.


More information


The valve of this taxon is elongate with convex sides and is tapered to rounded ends. It has a straight raphe valve that narrows at the ends. Its proximal ends curve in opposite directions and the central area of the taxon is elliptical. The striae are punctuate and they are oblique. The striae radiate in the middle of the valve but become parallel at the ends. It is variable in form and structure (Patrick and Reimer 1966).


  • Type Locality
    USA, New York, West Point, New England, Middle Atlantic States, Southeastern USA, Gulf Coast, South Central States, East Central States, West Central States, Lakes States, Plains States, Wyoming, Washington, Oregon, California (Patrick and Reimer 1966).
  • Ecology
    This taxon prefers slow or not moving water. It is found in lakes, ponds, and bogs. It is ph indifferent and is considered to be oligosaprobic (Patrick and Reimer 1966; Lowe 1974 ).

    Size ranges and morphology

  • Length is 50 to 190 micrometers (Patrick and Reimer 1966).
  • Width is 16 to 40 micrometers (Patrick and Reimer 1966).
  • Striae are 14 to 18 in 10 micrometers (Patrick and Reimer 1966).
  • Puncta are around 13 in 18 micrometers (Patrick and Reimer 1966).