Megalodon is now considered to be a member of the family Otodontidae, genus "Carcharocles". Megalodon's older classification into "Carcharodon" was due to dental similarity with the great white shark. Most authors now think this is due to convergent evolution. The great white shark is more closely related to the extinct broad-toothed mako ("Isurus hastalis") than to megalodon. The dentition in those two sharks is similar, whereas megalodon teeth have much finer serrations than great white shark teeth. The great white shark is more closely related to the mako shark ("Isurus" spp.), with a most recent common ancestor about 4 mya. Those who still think megalodon and the great white shark are more closely related, argue that the differences between their dentition are minute and obscure.