<Li> Schizophyceae Cohn, 1879 </Li> <Li> Cyanophyta Steinecke, 1931 </Li> <Li> Oxyphotobacteria Gibbons & Murray, 1978 </Li> <P> Cyanobacteria / saɪˌænoʊbækˈtɪəriə /, also known as Cyanophyta, are a phylum of bacteria that obtain their energy through photosynthesis, and are the only photosynthetic prokaryotes able to produce oxygen . The name "cyanobacteria" comes from the color of the bacteria (Greek: κυανός, translit . kyanós, lit .' blue'). Cyanobacteria, which are prokaryotes, are also called "blue - green algae", though the term "algae" in modern usage is restricted to eukaryotes . </P>

Where do cyanobacteria obtain c for synthesis of sugar