Dec 16, 2023
A group of tiny fossilized chondrichthyan teeth of Barbclabornia luedersensis from the Wellington Formation in Waurika, Jefferson County, Oklahoma, United States. The lack of a central cusp distinguishes this species from the contemporary xenacanthid, Orthacanthus. While its teeth are tiny compared to contemporaries like Orthacanthus, Barbclarbornia is believed to be the largest member of this clade, potentially growing up to 5 meters long. Despite shark-like appearances, xenacanths like Barbclabornia are not true sharks.