Biology:Gyrosigma
| Gyrosigma | |
|---|---|
| |
| Gyrosigma acuminatum | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Clade: | Stramenopiles |
| Phylum: | Gyrista |
| Subphylum: | Ochrophytina |
| 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 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, which allows the diatom to move.[3]
The valves of Gyrosigma are sigmoid in outline, as well as the raphe. There are striations parallel to the raphe, as well as striations perpendicular to the raphe. This contrasts with the 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
References
- ↑ 1.0 1.1 1.2 "Gyrosigma". Species. GBIF. http://www.gbif.org/species/7826612.
- ↑ Kociolek, J. Patrick; Theriot, Edward C.; Williams, David M.; Julius, Matthew; Stoermer, Eugene F.; Kingston, John C. (2014). "Chapter 15. Centric and Araphid Diatoms". Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc.. ISBN 978-0-12-385876-4.
- ↑ 3.0 3.1 Kociolek, J. Patrick; Spaulding, S. A.; Lowe, R. L. (2014). "Chapter 16. Bacillariophyceae: The Raphid Diatoms". Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc.. ISBN 978-0-12-385876-4.
Wikidata ☰ Q1558520 entry
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