anaerotruncus anaerotruncus anaerotruncus is a bacterial genus from the family of oscillospiraceae, with one known species (anaerotruncus colihominis). anaerotruncus bacteria occur in the human vaginal flora and gut. anaerotruncus scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: oscillospiraceae genus: anaerotruncuslawson et al. 2004 species a. colihominis