Subphylum [Vertebrata] Cuvier, 1812 - vertebrates Class Agnatha Cope, 1889 Subclass †Thelodonti Kiaer, 1932 Order †Loganelliiformes Turner, 1991 1 Family †Loganelliidae Karatajūtė-Talimaa, 1997 2 Family †Nunavutiidae Märss, Wilson & Thorsteinsson, 2002 [monotypic]