 Scientists determined that "Otodus" evolved into the genus "Carcharocles", given substantial fossil evidence in the form of transitional teeth.Some teeth have been excavated from the sediments of the Potomac River in Maryland, USA, Ypres clay in Belgium, and western Kazakhstan, which are morphologically very similar to "Otodus" teeth but with lightly serrated cusplets and a serrated cutting edge.These transitional fossils suggest a worldwide evolutionary event, and support the theory that "Otodus" eventually evolved into "Otodus" "aksuaticus" and thus initiated the "Carcharocles" lineage.