Cyanobacteria (Blue Green Algae) is a phylum of bacteria. There are 4190 species of Blue Green Algae, in 451 genera and 58 families. It includes groups like Oscillatoriales, Gloeobacteria, and Nostocales.
Definition: This organism produces this material or substance, either during its life or after death. A produces B if some process that occurs in A has output B.
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)