Epithemia
Genus of algae From Wikipedia, the free encyclopedia
Epithemia is a genus of diatoms belonging to the family Rhopalodiaceae.[1] The genus has cosmopolitan distribution and are found in freshwater and marine ecosystems.[2][1] Recent studies have proposed that the genus Rhopalodia should be recategorized to join Epithemia based on phylogenetic evidence,[3] although this change in nomenclature has been disputed.[4]
| Epithemia | |
|---|---|
| |
| Epithemia sorex | |
| Scientific classification | |
| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Clade: | Stramenopiles |
| Phylum: | Gyrista |
| Subphylum: | Ochrophytina |
| Class: | Bacillariophyceae |
| Order: | Rhopalodiales |
| Family: | Rhopalodiaceae |
| Genus: | Epithemia F.T.Kützing, 1844 |
Members of this genus have endosymbionts that fix nitrogen called spheroid bodies, that are derived from cyanobacteria.[5][6] This endosymbiont is closely related to the nitroplast organelle.[2][7] Because of this close relationship, Epithemia has been proposed as a model system to study the early stages of organelle evolution.
Because of their nitrogen fixing endosymbionts, they can be a possible indicator of eutrophication, because Epithemia abundance decreased with increased ambient inorganic N concentrations.[8] High concentrations Epithemia species would mean that there is more fixed nitrogen in the ecosystem and could act as an early indicator of nutrient overload.
Species
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Those marked with a * were previously in the genus Rhopalodia.[1]
- Epithemia adnata (Kützing) Brébisson, 1838
- Epithemia alpestris Kützing, 1844
- Epithemia alpestris W.Smith, 1853
- Epithemia anasthasiae Pantocsek, 1902
- Epithemia argus (Ehrenberg) Kützing 1844
- Epithemia catenata[2]
- Epithemia constricta W. Smith (Krammer)*[9]
- Epithemia gibba Kützing, 1844*
- Epithemia gibberula Kützing, 1844*
- Epithemia musculus Kützing, 1844*
- Epithemia pelagica[2]
- Epithemia reicheltii Schmidt et al. 1904
- Epithemia smithii Carruthers 1864
- Epithemia sorex Kützing, 1844
- Epithemia turgida Kützing, 1844
References
External links
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