Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Bacilli Ludwig et al. 2010
                   Order Bacillalesᵀ Prévot 1953 (Approved Lists 1980)
                     Genus Gemella Berger 1960 (Approved Lists 1980), incertae sedis
                       1 Gemella haemolysansᵀ (Thjøtta and Bøe 1938) Berger 1960 (Approved Lists 1980)
                       2 Gemella asaccharolytica Ulger-Toprak et al. 2010
                       3 Gemella bergeri corrig. Collins et al. 1998
                       4 Gemella cuniculi Hoyles et al. 2000
                       5 Gemella morbillorum (Prévot 1933) Kilpper-Bälz and Schleifer 1988
                       6 Gemella palaticanis Collins et al. 1999
                       7 Gemella parahaemolysans Hung et al. 2014
                       8 Gemella sanguinis Collins et al. 1999
                       9 Gemella taiwanensis Hung et al. 2014