Subphylum [Vertebrata] Cuvier, 1812 - vertebrates Class Agnatha Cope, 1889 Subclass †Thelodonti Kiaer, 1932 Order †Phlebolepidiformes Berg, 1937 Family †Phlebolepididae Berg, 1940 Genus †Helenolepis Karatajūtė-Talimaa, 1978