Gyrosigma spencerii v. curvula (Grun.) Reim.
Length:83

 Width :11

 Transverse striae:20

 Longitudinal striae:20+






























Collection 1387

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Gyrosigma spenceriivar. curvula (Grun.) Reim. comb. nov. pl. 23, fig. 8 (VanLandingham 1969).

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This image was taken using DIC.




This image is the end of the specimen above.


This image is the central area for the specimen above.


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This taxon has a valve that is linear or linear-lanceolate but not lanceolate as in the nominate variety. The ends are more gradually attenuated and are broader in relation to the vavle width in the center. The striae are more numerous than in spencerii. The striae, the raphe, the axial area, and the nodules are the same as in the nominate variety (Patrick and Reimer 1966).




  • Synonyms
    Pleurosigma spenceriivar. curvula Grun. inCl. & Grun., K. Svenska vet-Akad. Handl., Ny Foljd, 17(2):60. 1880(Patrick and Reimer 1966).


  • Ecology
    This taxon has been reported from brackish water areas and also from fresh water areas (Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 70 to 120 micrometers (Patrick and Reimer 1966).
  • Width is 9 to 11 micrometers (Patrick and Reimer 1966).
  • Transverse striae are 20 to 22 in 10 micrometers (Patrick and Reimer 1966).
  • Longitudinal striae are 24 to 25 in 10 micrometers (Patrick and Reimer 1966).