Lamna

Lamna is a genus of mackerel sharks in the family Lamnidae. It contains two extant species: the porbeagle (L. nasus) of the North Atlantic and Southern Hemisphere, and the salmon shark (L. ditropis) of the North Pacific.

Species

 * †Lamna attenuata
 * †Lamna carinata
 * Lamna ditropis
 * †Lamna hectori
 * †Lamna marginalis
 * Lamna nasus
 * †Lamna obliqua
 * †Lamna quinquelateralis
 * †Lamna trigeri
 * †Lamna trigonta

Endothermy
The extant species of this genus can keep their blood temperature higher above that of the water around them than other cartilaginous fish, with temperature differences recorded up to 15.6 °C.