[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Actinobacteria" Garrity and Holt 2001
       Class "Actinobacteria" Stackebrandt et al. 1997
         Subclass Actinobacteridae Stackebrandt et al. 1997 see Class Actinobacteria Stackebrandt et al. 1997
           Order Bifidobacteriales Stackebrandt et al. 1997
             Family Bifidobacteriaceae Stackebrandt et al. 1997
               Genus Bifidobacterium Orla-Jensen 1924 (Approved Lists 1980)
                 01 Bifidobacterium bifidum (Tissier 1900) Orla-Jensen 1924 (Approved Lists 1980)
                 02 Bifidobacterium adolescentis Reuter 1963 (Approved Lists 1980)
                 03 Bifidobacterium angulatum Scardovi and Crociani 1974 (Approved Lists 1980)
                 04 [Bifidobacterium animalis] (Mitsuoka 1969) Scardovi and Trovatelli 1974 (Approved Lists 1980)
                 05 Bifidobacterium asteroides Scardovi and Trovatelli 1969 (Approved Lists 1980)
                 06 Bifidobacterium boum Scardovi et al. 1979 (Approved Lists 1980)
                 07 Bifidobacterium breve Reuter 1963 (Approved Lists 1980)
                 08 Bifidobacterium catenulatum Scardovi and Crociani 1974 (Approved Lists 1980)
                 09 Bifidobacterium choerinum Scardovi et al. 1979 (Approved Lists 1980)
                 10 Bifidobacterium coryneforme (ex Scardovi and Trovatelli 1969) Biavati et al. 1982
                 11 Bifidobacterium cuniculi Scardovi et al. 1979 (Approved Lists 1980)
                 12 Bifidobacterium dentium Scardovi and Crociani 1974 (Approved Lists 1980)
                 13 Bifidobacterium gallicum Lauer 1990
                 14 Bifidobacterium gallinarum Watabe et al. 1983
                 15 Bifidobacterium indicum Scardovi and Trovatelli 1969 (Approved Lists 1980)
                 16 Bifidobacterium longum Reuter 1963 (Approved Lists 1980)
                 17 Bifidobacterium magnum Scardovi and Zani 1974 (Approved Lists 1980)
                 18 Bifidobacterium merycicum Biavati and Mattarelli 1991
                 19 Bifidobacterium minimum Biavati et al. 1982
                 20 Bifidobacterium pseudocatenulatum Scardovi et al. 1979 (Approved Lists 1980)
                 21 [Bifidobacterium pseudolongum] Mitsuoka 1969 (Approved Lists 1980)
                 22 Bifidobacterium psychraerophilum Simpson et al. 2004
                 23 Bifidobacterium pullorum Trovatelli et al. 1974 (Approved Lists 1980)
                 24 Bifidobacterium ruminantium Biavati and Mattarelli 1991
                 25 Bifidobacterium saeculare Biavati et al. 1992
                 26 Bifidobacterium scardovii Hoyles et al. 2002
                 27 Bifidobacterium subtile Biavati et al. 1982
                 28 [Bifidobacterium thermacidophilum] Dong et al. 2000
                 29 Bifidobacterium thermophilum corrig. Mitsuoka 1969 (Approved Lists 1980)