Title: Archaea - an overview | ScienceDirect Topics
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URL: https://www.sciencedirect.com/science/article/pii/B9780128146859000014
Gastrointestinal Microbiota
Jan S. Suchodolski, in Canine and Feline Gastroenterology, 2013
Archaea
Archaea are single-celled microorganisms with structure similar to bacteria. They are evolutionarily distinct from bacteria and eukaryotes and form the third domain of life. Archaea are obligate anaerobes living in environments low in oxygen (e.g., water, soil). Archaea are commensal in the intestine of ruminants and have recently been described in the human intestine, with Methanobacteriales most commonly reported. 28,29 Recent 16S rRNA gene-based studies in the author's laboratory revealed two distinct archaeal phyla in the intestine of dogs and cats: Crenarchaeota and Euryarchaeota. Similar to man, Methanobacteria were the most abundant class of archaea. The role of archaea in GI health and disease remains unclear. Methanogens are associated with periodontal disease in man.