[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class "Clostridia" Garrity et al. 2001 nom. ined. see Class Clostridia Rainey 2010
         Order Clostridiales Prévot 1953 (Approved Lists 1980)
           Family "Peptostreptococcaceae" see Family Peptostreptococcaceae Ezaki 2010
             Genus Anaerococcus Ezaki et al. 2001
               1 Anaerococcus prevotii (Foubert and Douglas 1948) Ezaki et al. 2001
               2 Anaerococcus hydrogenalis (Ezaki et al. 1990) Ezaki et al. 2001
               3 Anaerococcus lactolyticus (Li et al. 1992) Ezaki et al. 2001
               4 Anaerococcus octavius (Murdoch et al. 1997) Ezaki et al. 2001
               5 Anaerococcus tetradius (Ezaki et al. 1983) Ezaki et al. 2001
               6 Anaerococcus vaginalis (Li et al. 1992) Ezaki et al. 2001