Subphylum [Vertebrata] Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Class Agnatha Cope, 1889
     Subclass †Thelodonti Kiaer, 1932
       Order †Loganelliiformes Turner, 1991
         Family †Loganelliidae Karatajūtė-Talimaa, 1997, nom. nud.
           1 Genus †Loganelliaᵀ Fredholm, 1990
           2 Genus †Illoganellia Märss, Wilson & Thorsteinsson, 2002 [monotypic]