Lamna is a genusofmackerel sharks in the family Lamnidae, containing two extant species: the porbeagle (L. nasus) of the North Atlantic and Southern Hemisphere, and the salmon shark (L. ditropis) of the North Pacific.
| Lamna
Earliest Danian to Present | |
|---|---|
| |
| Porbeagle (L. nasus) | |
| |
| Salmon shark (L. ditropis) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Subdivision: | Selachimorpha |
| Order: | Lamniformes |
| Family: | Lamnidae |
| Genus: | Lamna Cuvier, 1816 |
| Type species | |
| Lamna nasus Bonnaterre, 1788 porbeagle | |
| Synonyms | |
| |
The two species of this genus can keep their blood temperature higher above that of the water surrounding them than other cartilaginous fish, with temperature differences recorded up to 15.6 °C.[2][3][4] Among fish, blood temperature regulation only occurs in large, fast species – bluefin tuna and swordfish are bony fish with similar abilities.