Phylum Chordata Bateson, 1885 - chordates Class †Conodonta Eichenberg, 1930 Subclass †Conodonti Branson see Subclass Conodonta Eichenberg, 1930 Order †Ozarkodinida Dzik Family †Spathognathodontidae Hass Genus †Mehlina Youngquist, 1945 †Mehlina ovata D.I. Johnston & B.D.E. Chatterton, 2001