Serratolamna

Serratolamna is an extinct genus of mackerel sharks belonging to the family Cretoxyrhinidae.
These sharks lived 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".
Species.
Species within this genus include:
Description.
The fossils of "Serratolamna" mainly consist of teeth and scattered vertebrae. The teeth are asymmetrical with smooth crowns and multiple cusplets. The basal margin of the roots are V-shaped. Based on the size of its teeth, it appears "Serratolamna" grew no larger than 1.5 metres.
Distribution.
Fossils of species within this genus have been found in the Eocene sediments in United States and in the Cretaceous of France, Madagascar, Mexico, Morocco, Sweden and United States.