Taxonomic revisions of Upper Cambrian Granatodontus Chen et Gong, 1986 of the Dasytodus Lineage (Conodonta)

摘要

The Upper Cambrian conodont taxa of the Dasytodontus Lineage is particularly useful to divide strata near Cambrian-Ordovician boundary. This lineage known only in Korea, China and Australia include many coniform paraconodonts and euconodonts with granulose, spinose or nodose ornaments, comprising Granatodontus Chen et Gong, 1986. The generic and specific concepts of Granatodontus are reviewed herein, with comments on its evolution, paleoecology and geographic distribution. Two new species are erected: Granatodontus asymmetrica sp. nov. and Granatodontus multicorrugata sp. nov.