Wikipedia
Serratolamna
Serratolamna is an extinct genus of mackerel sharks belonging to the family Cretoxyrhinidae.
These sharks lived during from the Cretaceous period to the Eocene epoch, approximately from 99.7 to 50.3 million years ago.
Similar and related genera include Cretodus, Cretolamna, Cretoxyrhina, Dallasiella, Paraisurus, Plicatolamna.