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 1 ?Genus Actinobispora Jiang et al. 1991 see Genus Pseudonocardia Henssen 1957 (Approved Lists 1980) 2 ?Genus Actinocorallia Iinuma et al. 1994 3 ?Genus Excellospora Agre and Guzeva 1975 (Approved Lists 1980) see Genus Actinomadura Lechevalier and Lechevalier 1968 (Approved Lists 1980) 4 ?Genus Pelczaria Poston 1994 nom. rej. 5 ?Genus Turicella Funke et al. 1994 6 Family Bifidobacteriaceae Stackebrandt et al. 1997