Two shark finspines (Hybodontoidea) from the Mesozoic of North China

Two hybodont finspines are described in this paper. An incomplete dorsal finspine from the Middle Jurassic Anting Formation of Shaanxi Province, northwest China, is thought to be from Hybodus antingensis as it is the only shark known in the deposit. It represents the first hybodont finspine to be found in association with teeth in China. A nearly complete dorsal finspine from the Lower Cretaceous Yixian Formation in Liaoning Province, northeast China, represents the first fossil shark to have been recorded from the Jehol Biota. It is identified as Hybodontoidea incertae familiae.