anaerococcus tetradius anaerococcus tetradius anaerococcus tetradius is a bacterium from the family peptoniphilaceae. it was first isolated from vaginal discharges and ovarian abscesses, but is a common member of the vaginal flora. anaerococcus tetradius scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: peptoniphilaceae genus: anaerococcus species: a. tetradius binomial name anaerococcus tetradius(ezaki et al. 1983) ezaki et al. 2001 synonyms gaffkya anaerobia gaffkya anaerobius peptostreptococcus tetradius tetracoccus anaerobius biochemistry a. tetradius can ferment glucose and mannose.