Calothrix

Calothrix
	A 1921 drawing of Calothrix
Scientific classification
Domain:	Bacteria
Kingdom:	Bacillati
Phylum:	Cyanobacteriota
Class:	Cyanophyceae
Order:	Nostocales
Family:	Rivulariaceae
Genus:	Calothrix; Bornet & Flahault 1886
Type species
	Calothrix confervicola; Agardh ex Bornet and Flahault 1886;
Species
	Calothrix adscendens ; Calothrix atricha ; Calothrix braunii ; Calothrix breviarticulata ; Calothrix caespitora ; Calothrix confervicola ; Calothrix crustacea ; Calothrix donnelli ; Calothrix elenkinii ; Calothrix epiphytica ; Calothrix fusca ; Calothrix juliana ; Calothrix parasitica ; Calothrix parietina ; Calothrix pilosa ; Calothrix pulvinata ; Calothrix scopulorum ; Calothrix scytonemicola ; Calothrix simulans ; Calothrix solitaria ; Calothrix stagnalis ; Calothrix stellaris ; Calothrix thermalis ; Calothrix 336/3

Calothrix is a genus of cyanobacteria. They are generally found in freshwater.^[2]

Removed members

Some members of the genus such as Calothrix rhizosoleniae are endosymbionts of diatoms, providing a nitrogen-fixing function.^[3] It is assigned by Bergey's to Richelia, which is closely related to this species (unlike the rest of Calothrix.^[4]^[5]

GTDB Release 10-RS226 (16th April 2025) does not include Calothrix as a genus, opting to instead assign its members to other genera. No genomes of the type species are available.^[6]

References

↑ "Calothrix". AlgaeBase. Retrieved 14 April 2018.
↑ Rippka R, Castenholz RW, Herdman M (2015). "Form-Calothrix". In Whitman WB (ed.). Bergey's Manual of Systematics of Archaea and Bacteria. doi:10.1002/9781118960608.gbm00462.
↑ Hilton JA, Foster RA, Tripp HJ, Carter BJ, Zehr JP, Villareal TA (23 April 2013). "Genomic deletions disrupt nitrogen metabolism pathways of a cyanobacterial diatom symbiont". Nature Communications. 4 (1) 1767. Bibcode:2013NatCo...4.1767H. doi:10.1038/ncomms2748. PMC 3667715. PMID 23612308.
↑ Grujcic, Vesna; Mehrshad, Maliheh; Vigil-Stenman, Theo; Lundin, Daniel; Foster, Rachel A. (September 2025). "Stepwise genome evolution from a facultative symbiont to an endosymbiont in the N2-fixing diatom-Richelia symbioses". Current Biology. 35 (18): 4479–4493.e3. doi:10.1016/j.cub.2025.08.003.
↑ "Richelia". Bergey's Manual of Systematics of Archaea and Bacteria. May 2022. doi:10.1002/9781118960608.gbm01520.
↑ "GTDB - Search: Calothrix". gtdb.ecogenomic.org.

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[1] "Calothrix". AlgaeBase. Retrieved 14 April 2018.

[2] Rippka R, Castenholz RW, Herdman M (2015). "Form-Calothrix". In Whitman WB (ed.). Bergey's Manual of Systematics of Archaea and Bacteria. doi:10.1002/9781118960608.gbm00462.

[Hilton-2013-3] Hilton JA, Foster RA, Tripp HJ, Carter BJ, Zehr JP, Villareal TA (23 April 2013). "Genomic deletions disrupt nitrogen metabolism pathways of a cyanobacterial diatom symbiont". Nature Communications. 4 (1) 1767. Bibcode:2013NatCo...4.1767H. doi:10.1038/ncomms2748. PMC 3667715. PMID 23612308.

[4] Grujcic, Vesna; Mehrshad, Maliheh; Vigil-Stenman, Theo; Lundin, Daniel; Foster, Rachel A. (September 2025). "Stepwise genome evolution from a facultative symbiont to an endosymbiont in the N2-fixing diatom-Richelia symbioses". Current Biology. 35 (18): 4479–4493.e3. doi:10.1016/j.cub.2025.08.003.

[BeRi-5] "Richelia". Bergey's Manual of Systematics of Archaea and Bacteria. May 2022. doi:10.1002/9781118960608.gbm01520.

[6] "GTDB - Search: Calothrix". gtdb.ecogenomic.org.

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Calothrix

Removed members

References