Monera

Taxonomy, description, and extensive references, with particular emphasis on the Crenarchaeota (classified here as a Kingdom.)

Taxonomy browser, with some links.

Reports the decoding of the Pyrococcus abyssi, which lives in the intense pressure and temperature of black smoker vents on the seafloor.

Alphabetically and chronologically arranged lists of taxa, with additional information on bacterial taxonomy.

Information on these algae, the earliest organisms to be preserved in the fossil record, with a diagram and photomicrographs of Anabaena.

Information from Wikipedia on this phylum of bacteria which include many of the species found in the stomachs of ruminants.