Gyrosigma

Gyrosigma
Gyrosigma acuminatum
Scientific classification Edit this classification
Domain: Eukaryota
Supergroup: 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.

The genus has a cosmopolitan distribution.

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. Gyrosigma has valves with a central slit called a raphe, a structure that allows movement of these diatoms.

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.

Species

Species:

References

  1. 1 2 3 "Gyrosigma". Global Biodiversity Information Facility. Retrieved 24 April 2021.
  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.
  3. 1 2 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.