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.
           Genus †Loganelliaᵀ Fredholm, 1990
             1 †Loganellia sulcata Märss, Wilson & Thorsteinsson, 2002
             2 †Loganellia prolata Märss, Wilson & Thorsteinsson, 2002
             3 †Loganellia exilis Märss, Wilson & Thorsteinsson, 2002