Lamna

Lamna
Temporal range: 65–0 Ma Earliest Paleocene to Present
Porbeagle (L. nasus)
Salmon shark (L. ditropis)
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Division: Selachii
Order: Lamniformes
Family: Lamnidae
Genus: Lamna
Cuvier, 1816
Type species
Squalus nasus
Bonnaterre, 1788 porbeagle
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.

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

Fossil Record and Species

The genus Lamna actually includes only two extant species: Salmon shark (Lamna ditropis) and Porbeagle (Lamna nasus). Most fossils of genus Lamna are found in deposits of Early Miocene and to the Pliocene, often confused with the genus Carcharias, Odontaspis and other genera. Some fossils of the genus Lamna have also been found in Paleocene and Eocene deposits, being almost entirely absent in the Oligocene period or confused and classified as Isurolamna.

Paleogene

Neogene

See also

References

  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 marinebio.org
  4. ↑ C. Larsen, H. Malte, R. E. Weber: “ATP-induced Reverse Temperature Effect in Isohemoglobins from the Endothermic Porbeagle Shark” Archived 2007-09-29 at the Wayback Machine, Journal of Biological Chemistry vol. 278, issue 33, 30741–30747, 2003-08-15
  5. ↑ Agassiz, L. (1843). "Recherches sur les poissons fossiles, 15th and 16th livraisons (March 1843)". Jent and Gassmann, Soleure (text) and H. Nicolet, Neuchâtel (planches). 3: 157–390.
  6. ↑ "Lamna vincenti (Winkler, 1874)". Shark-References.
  7. ↑ Davis, J.W. (1888). "On fossil fish-remains from the Tertiary and Cretaceo-Tertiary formations of New-Zealand". Scientific Transactions of the Royal Dublin Society. 4: 1–48.
  8. ↑ Chapman, F., Cudmore, F.A. (1924). "Some Cainozoic fish remains, vvith a revision of the group". Proceedings of the Royal Society of Victoria. 36: 107–162.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  9. ↑ Bazzi, M., Ahlberg, P.E. (2021). "Feeding ecology has shaped the evolution of modern sharks". Current Biology: 5138–5148.{{cite journal}}: CS1 maint: multiple names: authors list (link)