Gyrosigma spencerii (Quek.) Griff. & Henfr.,


Width :12

Transverse striae:18

Longitudinal striae:20+

Collection 1279a

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Authority information

Gyrosigma spencerii(Quek.) Griff. & Henfr., Microgr. Dict., 1st ed., p. 303, pl. 11, fig. 17. 1856 (Patrick and Reimer 1966).

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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 moderately sigmoid and lanceolate valve. The valve tapers to narrow and rounded ends. The axial area and the raphe are slightly undulate and the terminal area is slightly eccentric. This taxons has a small and longitudinally elliptical central area and the transverse and longitudinal striae are equally distinct (Patrick and Reimer 1966).

  • Synonyms
    Navicula spencerii Quek., Pract. Treat. Micr., p. 440, pl. 9. 1848 (Patrick and Reimer 1966).
    Pleurosigma spencerii(Quek.) W. Sm., Ann. Mag. Nat. Hist., ser. 2, 9:12, pl. 2. fogs/ 15-16. 1852 (Patrick and Reimer 1966).
    Pleurosigma kutzingiiGrun., Verh. Zool.-Bot. Ges. Wien, 10:561, pl. 6, fig. 3. 1860 (Patrick and Reimer 1966).
    Pleurosigma gracilentumRabh., Fl. Europaea Alg., sect. 1, p. 240. 1864 (Patrick and Reimer 1966).
    Gyrosigma kutzingii(Grun.) Cl., K. Svenska Vet.-Akad. Handl., Ny Foljd, 26(2):115. 1894 (Patrick and Reimer 1966).

  • Ecology
    This taxon is common in creeks, rivers and lakes. It is alkaliphil, oligohalobe and can stand some salt concentration(Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 95 to 140 micrometers (Patrick and Reimer 1966).
  • Width is 13 to 15 micrometers (Patrick and Reimer 1966).
  • Transverse striae are 18 to 20 in 10 micrometers (Patrick and Reimer 1966).
  • Longitudinal striae are 22 to 24 in 10 micrometers (Patrick and Reimer 1966).