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: Earliest Danian to Present
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| Porbeagle (L. nasus) | |
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| Salmon shark (L. ditropis) | |
Scientific classification 
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| 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
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| Synonyms | |
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Endothermy edit
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 edit
- †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 edit
References edit
- ^ 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.
- ^ 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
- ^ Salmon shark, Lamna ditropis at marinebio.org
- ^ 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