Lamna

Lamna Temporal range: 65–0 Ma PreЄ Є O S D C P T J K Pg N Danian to Present
Porbeagle (L. nasus)
Salmon shark (L. ditropis)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Superorder:	Selachimorpha
Order:	Lamniformes
Family:	Lamnidae
Genus:	Lamna Cuvier, 1816
Type species
Squalus cornubicus Bloch and Schneider, 1801
Synonyms
Exoles Gistel, 1848 Lamia Risso, 1827 Selanonius Fleming, 1828

Lamna is a genus of mackerel 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.

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. Among fish, blood temperature regulation only occurs in large, fast species – bluefin tuna and swordfish are bony fish with similar abilities.