Phylum Chordata Bateson, 1885 - chordates Class †Conodonta Eichenberg, 1930 Subclass †Conodonti Branson see Subclass Conodonta Eichenberg, 1930 Order †Ozarkodinida Dzik Family †Elictognathidae Austin & Rhodes Genus †Alternognathus Ziegler & Sandberg, 1984 †Alternognathus regularis Ziegler & Sandberg