Subphylum [Vertebrata] Cuvier, 1812 - vertebrates Class Agnatha Cope, 1889 Subclass †Thelodonti Kiaer, 1932 Order †Loganelliiformes Turner, 1991 Family †Loganelliidae Karatajūtė-Talimaa, 1997 Genus †Illoganellia Märss, Wilson & Thorsteinsson, 2002 [monotypic] †Illoganellia colosseaᵀ Märss, Wilson & Thorsteinsson, 2002