Lamna

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.

Lamna Temporal range: 65–0 Ma[1] PreꞒ Ꞓ O S D C P T J K Pg N Earliest Danian to Present
Porbeagle (L. nasus)
Salmon shark (L. ditropis)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Division:	Selachii
Order:	Lamniformes
Family:	Lamnidae
Genus:	Lamna Cuvier, 1816
Type species
Lamna nasus Bonnaterre, 1788 porbeagle
Synonyms
Exoles Gistel, 1848 Lamia Risso, 1827 Selanonius Fleming, 1828

Endothermy

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.

Species

• †Lamna attenuata (Davis, 1888)
• †Lamna carinata (Davis, 1888)
• Lamna ditropis C. L. Hubbs & Follett, 1947 (salmon shark)
• †Lamna hectori (Davis, 1888)
• †Lamna marginalis (Davis, 1888)
• Lamna nasus (Bonnaterre, 1788) (porbeagle)
• †Lamna quinquelateralis (Cragin, 1894)
• †Lamna trigeri (Coquand, 1860)
• †Lamna trigonata (Agassiz, 1843)

See also

• List of prehistoric cartilaginous fish