Epithemia

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Epithemia
Epithemia sorex guertelbandansicht.jpeg
Epithemia sorex
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Clade: Sar
Clade: Stramenopiles
Phylum: Ochrophyta
Clade: Diatomeae
Class: Bacillariophyceae
Subclass: Bacillariophycidae
Genus: Epithemia
F.T.Kützing, 1844

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]

Contents

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]

Species

Those marked with a * were previously in the genus Rhopalodia. [1]

References

  1. 1 2 3 "Epithemia F.T.Kützing, 1844". www.gbif.org. Retrieved 23 April 2021.
  2. 1 2 3 4 Schvarcz, Christopher R.; Wilson, Samuel T.; Caffin, Mathieu; Stancheva, Rosalina; Li, Qian; Turk-Kubo, Kendra A.; White, Angelicque E.; Karl, David M.; Zehr, Jonathan P.; Steward, Grieg F. (2022-02-10). "Overlooked and widespread pennate diatom-diazotroph symbioses in the sea". Nature Communications. 13 (1): 799. Bibcode:2022NatCo..13..799S. doi:10.1038/s41467-022-28065-6. ISSN   2041-1723. PMC   8831587 . PMID   35145076.
  3. ↑ Ruck, Elizabeth C.; Nakov, Teofil; Alverson, Andrew J.; Theriot, Edward C. (2016-10-01). "Phylogeny, ecology, morphological evolution, and reclassification of the diatom orders Surirellales and Rhopalodiales" . Molecular Phylogenetics and Evolution. 103: 155–171. Bibcode:2016MolPE.103..155R. doi: 10.1016/j.ympev.2016.07.023 . ISSN   1055-7903. PMID   27456747.
  4. ↑ Kociolek, J.P.; Greenwood, M.; Hamsher, S.E.; Miller, S.; Li, J. (2024-04-02). "Valve ultrastructure of Rhopalodia constricta (W.Smith) Krammer (Rhopalodiales, Bacillariophyceae) and a consideration of its systematic placement" . Diatom Research. 39 (2): 51–60. Bibcode:2024DiaRe..39...51K. doi:10.1080/0269249X.2024.2378769. ISSN   0269-249X.
  5. ↑ Nakayama, Takuro; Kamikawa, Ryoma; Tanifuji, Goro; Kashiyama, Yuichiro; Ohkouchi, Naohiko; Archibald, John M.; Inagaki, Yuji (2014-08-05). "Complete genome of a nonphotosynthetic cyanobacterium in a diatom reveals recent adaptations to an intracellular lifestyle". Proceedings of the National Academy of Sciences. 111 (31): 11407–11412. Bibcode:2014PNAS..11111407N. doi: 10.1073/pnas.1405222111 . ISSN   0027-8424. PMC   4128115 . PMID   25049384.
  6. ↑ Nakayama, Takuro; Ikegami, Yuko; Nakayama, Takeshi; Ishida, Ken-ichiro; Inagaki, Yuji; Inouye, Isao (2011-01-01). "Spheroid bodies in rhopalodiacean diatoms were derived from a single endosymbiotic cyanobacterium" . Journal of Plant Research. 124 (1): 93–97. Bibcode:2011JPlR..124...93N. doi:10.1007/s10265-010-0355-0. ISSN   1618-0860. PMID   20512519.
  7. ↑ Abresch, Heidi; Bell, Tisza; Miller, Scott R (2024-01-01). "Diurnal transcriptional variation is reduced in a nitrogen-fixing diatom endosymbiont". The ISME Journal. 18 (1). doi:10.1093/ismejo/wrae064. ISSN   1751-7362. PMC   11131595 . PMID   38637300.
  8. ↑ Stancheva, Rosalina; Sheath, Robert G.; Read, Betsy A.; McArthur, Kimberly D.; Schroepfer, Chrystal; Kociolek, J. Patrick; Fetscher, A. Elizabeth (2013-12-01). "Nitrogen-fixing cyanobacteria (free-living and diatom endosymbionts): their use in southern California stream bioassessment" . Hydrobiologia. 720 (1): 111–127. Bibcode:2013HyBio.720..111S. doi:10.1007/s10750-013-1630-6. ISSN   1573-5117. S2CID   254550477.
  9. ↑ Kociolek, J.P.; Greenwood, M.; Hamsher, S.E.; Miller, S.; Li, J. (2024-04-02). "Valve ultrastructure of Rhopalodia constricta (W.Smith) Krammer (Rhopalodiales, Bacillariophyceae) and a consideration of its systematic placement" . Diatom Research. 39 (2): 51–60. Bibcode:2024DiaRe..39...51K. doi:10.1080/0269249X.2024.2378769. ISSN   0269-249X.
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