methanosaetaceae methanosaetaceae in taxonomy, the methanosaetaceae are a family of microbes within the order methanosarcinales. all species within this family use acetate as their sole source of energy. methanosaetaceae scientific classification domain: archaea phylum: euryarchaeota class: methanomicrobia order: methanosarcinales family: methanosaetaceaeboone, whitman & koga 2002 genus methanosaeta synonyms methanotrichaceae akinyemi et al. 2021