Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Bacillotaᵀ Gibbons and Murray 2021
                 Class Bacilliᵀ Ludwig et al. 2010
                   Order Lactobacillales Ludwig et al. 2010
                     Family Streptococcaceae Deibel and Seeley 1974 (Approved Lists 1980)
                       Genus Lactococcus Schleifer et al. 1986
                         Lactococcus lactis (Lister 1873) Schleifer et al. 1986
                           1 Lactococcus lactis subsp. lactisᵀ (Lister 1873) Schleifer et al. 1986
                           2 Lactococcus lactis subsp. cremoris (Orla-Jensen 1919) Schleifer et al. 1986
                           3 Lactococcus lactis subsp. hordniae (ex Latorre-Guzman et al. 1977) Schleifer et al. 1986
                           4 Lactococcus lactis subsp. tructae Pérez et al. 2011