Calothrix

{{Short description|Genus of bacteria}}

{{Automatic taxobox

| image = FMIB 53553 Calothrix.jpeg

| image_caption = A 1921 drawing of Calothrix

| taxon = Calothrix

| authority = Bornet & Flahault 1886{{cite web|title=Calothrix|website=AlgaeBase|url=http://www.algaebase.org/search/genus/detail/?genus_id=e72f7bde74b4a1ec1&-session=abv4:AC1F10080a1ca385A6HQ2B772EE5 |accessdate=14 April 2018}}

| subdivision_ranks = Species

| subdivision = 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.{{cite book|chapter=Form-Calothrix |title=Bergey's Manual of Systematics of Archaea and Bacteria |vauthors=Rippka R, Castenholz RW, Herdman M |date=2015 |doi=10.1002/9781118960608.gbm00462 |editor=Whitman WB}}

File:Cyanobacteria in symbiosis with a diatom.png image of epiphytic cyanobacterial symbiont Calothrix rhizosoleniae SC01 9 (indicated by arrows) attached to a host diatom Chaetoceros sp. (c). Scale bar, 50 μm.]]

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