| Calothrix | 
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| A 1921 drawing of Calothrix | 
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| Scientific classification | 
| Domain: | Bacteria | 
 
| Kingdom: | Bacillati | 
 
| Phylum: | Cyanobacteria | 
 
| Class: | Cyanophyceae | 
 
| Order: | Nostocales | 
 
| Family: | Rivulariaceae | 
 
| Genus: | Calothrix Bornet & Flahault 1886
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| 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
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Calothrix is a genus of cyanobacteria. They are generally found in freshwater.