The early silurian Ozarkodina kozhimica group (conodonta) from the Subpolar Urals

Morphology of elements composing apparatuses of conodont genus Ozarkodina were studied from the Llandovery strata of the Subpolar Urals (Kozhym River sections). Transitional forms between the Pa-elements of O. kozhimica Melnikov and O. waugoolaensis Bischoff have been recovered from the uppermost Aeronian deposits in the Kozhym River sections and identified herein as O. aff. waugoolaensis. The Pa-elements of O. aff. waugoolaensis have a shorter and higher blade and more regular denticulation on their anterior process than those of O. waugoolaensis, and better-developed main and secondary cusps than those of O. kozhimica.