[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 "Bacilli" Garrity et al. 2001 nom. ined. see Class Bacilli Ludwig et al. 2010
         Order Bacillales Prévot 1953 (Approved Lists 1980)
           Family "Listeriaceae" Garrity and Holt 2001 nom. nud. see Family Listeriaceae Ludwig et al. 2010
             Genus Listeria Pirie 1940 (Approved Lists 1980)
               1 Listeria monocytogenes (Murray et al. 1926) Pirie 1940 (Approved Lists 1980)
               2 Listeria grayi Errebo Larsen and Seeliger 1966 (Approved Lists 1980)
               3 Listeria innocua (ex Seeliger and Schoofs 1979) Seeliger 1983
               4 [Listeria ivanovii] Seeliger et al. 1984
               5 Listeria seeligeri Rocourt and Grimont 1983
               6 Listeria welshimeri Rocourt and Grimont 1983