Gyrosigma

Gyrosigma
	Gyrosigma acuminatum
Scientific classification
Domain:	Eukaryota
Clade:	Sar
Clade:	Stramenopiles
Division:	Ochrophyta
Clade:	Bacillariophyta
Class:	Bacillariophyceae
Order:	Naviculales
Family:	Pleurosigmataceae
Genus:	Gyrosigma; A.H.Hassall, 1845

Gyrosigma is a genus of diatoms belonging to the family Pleurosigmataceae.¹

The genus has a cosmopolitan distribution.¹

Like other diatoms, Gyrosigma has a siliceous cell wall called a frustule. The frustule is composed of two sections called valves, with one valve fitting inside the other valve similar to the two halves of a Petri dish.² Gyrosigma has valves with a central slit called a raphe, a structure that allows movement of these diatoms.³

The valves of Gyrosigma are sigmoid in outline, as well as the raphe. Striations could be parallel or perpendicular to the raphe. This contrasts to a similar genus Pleurosigma, which has striations that lie diagonally to the raphe.³

Species

Species:¹

Gyrosigma acuminatum (Kützing) Rabenhorst, 1853
Gyrosigma aestuarium Kisselev, 1925
Gyrosigma algoris J.R.Carter, 1981
Gyrosigma angulatum (Quekett) Griffith & Henfrey
Gyrosigma apula Rabenhorst, 1853
Gyrosigma arcticum (Cleve) Cleve, 1894
Gyrosigma attenuatum (Kützing) Rabenhorst, 1853
Gyrosigma baculum W.E.Herwig & F.A.S.Sterrenburg, 2014
Gyrosigma baicalense
Gyrosigma baikalensis Skvortzov, 1937
Gyrosigma balticum (Ehrenberg) Rabenhorst, 1853
Gyrosigma beaufortianum Hustedt, 1955
Gyrosigma bhusavalensis Sarode & Kamat, 1984
Gyrosigma bigibbum Zanon, 1949
Gyrosigma caffra Giffen, 1963
Gyrosigma calaritanum Zanon, 1948
Gyrosigma cali G.Reid, 2003
Gyrosigma centropunctatum Yuhang Li, Nagumo & Kuidong Xu, 2020
Gyrosigma coelophilum Okamoto & Nagumo, 2003
Gyrosigma compactum (Greville) Cleve, 1894
Gyrosigma constrictum Volkov, 1936
Gyrosigma contortum Mereschkowsky, 1902
Gyrosigma crassum Meister, 1934
Gyrosigma curtum E.Reichardt, 2020
Gyrosigma curvulum Rabenhorst, 1853
Gyrosigma cuspidata Rabenhorst, 1853
Gyrosigma diaphanum Cleve, 1894
Gyrosigma diminutum (W.Smith) Cleve
Gyrosigma dissimilis Y.A.Mikishin, 1991
Gyrosigma distortoides Manguin, 1952
Gyrosigma diversitatum Giffen, 1970
Gyrosigma dongzhaiense Yuhang Li, Nagumo & Kuidong Xu, 2020
Gyrosigma dubia Rabenhorst, 1853
Gyrosigma dubium Meister, 1934

References

"Gyrosigma". Global Biodiversity Information Facility. Retrieved 24 April 2021.
Kociolek, J. Patrick; Theriot, Edward C.; Williams, David M.; Julius, Matthew; Stoermer, Eugene F.; Kingston, John C. (2014). "Chapter 15. Centric and Araphid Diatoms". In Wehr, John D.; Sheath, Robert G.; Kociolek, J. Patrick (eds.). Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc. ISBN 978-0-12-385876-4.
Kociolek, J. Patrick; Spaulding, S. A.; Lowe, R. L. (2014). "Chapter 16. Bacillariophyceae: The Raphid Diatoms". In Wehr, John D.; Sheath, Robert G.; Kociolek, J. Patrick (eds.). Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc. ISBN 978-0-12-385876-4.

[GBIF-1] "Gyrosigma". Global Biodiversity Information Facility. Retrieved 24 April 2021.

[Wehr_Chapter15-2] Kociolek, J. Patrick; Theriot, Edward C.; Williams, David M.; Julius, Matthew; Stoermer, Eugene F.; Kingston, John C. (2014). "Chapter 15. Centric and Araphid Diatoms". In Wehr, John D.; Sheath, Robert G.; Kociolek, J. Patrick (eds.). Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc. ISBN 978-0-12-385876-4.

[Wehr_Chapter16-3] Kociolek, J. Patrick; Spaulding, S. A.; Lowe, R. L. (2014). "Chapter 16. Bacillariophyceae: The Raphid Diatoms". In Wehr, John D.; Sheath, Robert G.; Kociolek, J. Patrick (eds.). Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc. ISBN 978-0-12-385876-4.

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