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Temporal range: 65–0 Ma[1] Earliest Danian to Present
Lamna nasus noaa.jpg
Porbeagle (L. nasus)
Lamna ditropis.jpg
Salmon shark (L. ditropis)
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Lamniformes
Family: Lamnidae
Genus: Lamna
Cuvier, 1816
Type species
Lamna nasus
Bonnaterre, 1788 porbeagle
  • 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.[2][3][4] Among fish, blood temperature regulation only occurs in large, fast species – bluefin tuna and swordfish are bony fish with similar abilities.


See also[edit]


  1. ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Chondrichthyes entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2011-09-30. Retrieved 2008-01-09.
  2. ^ Abstract for S. D. Anderson, K. J. Goldman: “Temperature Measurements from Salmon Sharks, Lamna ditropis, in Alaskan Waters”, Copeia, Vol. 2001, No. 3, 2001-08-06
  3. ^ Salmon shark, Lamna ditropis at
  4. ^ C. Larsen, H. Malte, R. E. Weber: “ATP-induced Reverse Temperature Effect in Isohemoglobins from the Endothermic Porbeagle Shark”, Journal of Biological Chemistry vol. 278, issue 33, 30741–30747, 2003-08-15