"Microbes" spreads across all of the three deepest divisions, or domains, of life on
our planet: Bacteria, Archaea, and Eukarya, and is a term that includes all single-celled organisms: autotrophic and
heterotrophic prokaryotes (bacteria and cyanobacteria) and autotrophic and heterotrophic eukaryotes (algae and phagotrophic
protists), as well as viruses.
p.13; in ....
Sherr E., Sherr B.; 2000; Marine Microbes – an Overview; in Kirchman D.L. (ed);
Microbial Ecology of the Oceans; Willey-Liss Inc.; New York – USA;