View source for Lamna

{{Short description|Genus of sharks}}
{{Automatic taxobox
| fossil_range = {{Fossil range|65|0|ref=<ref>{{cite journal|last=Sepkoski |first=Jack |title=A compendium of fossil marine animal genera (Chondrichthyes entry) |journal=Bulletins of American Paleontology |volume=363 |pages=1–560 |date=2002 |url=http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=575&rank=class |access-date=2008-01-09 |url-status=dead |archive-url=https://web.archive.org/web/20110930154826/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=575&rank=class |archive-date=2011-09-30 }}</ref>}}<small>Earliest [[Danian]] to Present</small>
| image = Lamna nasus noaa.jpg
| image_caption = [[Porbeagle|Porbeagle (''L. nasus'')]]
| image2 = Salmon Shark, Oceano, CA 93445, USA imported from iNaturalist photo 142845394 (cropped).jpg
| image2_caption = [[Salmon shark|Salmon shark (''L. ditropis'')]]
| taxon = Lamna
| authority = [[Georges Cuvier|Cuvier]], 1816
| type_species = [[Porbeagle|''Lamna nasus'']]
| type_species_authority = Bonnaterre, 1788 porbeagle
| subdivision_ranks = 
| subdivision = 
| synonyms = * ''Exoles'' <small>Gistel, 1848</small>
* ''Lamia'' <small>Risso, 1827</small>
* ''Selanonius'' <small>Fleming, 1828</small>
}}

'''''Lamna''''' is a [[genus]] of [[Lamniformes|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 [[Warm-blooded#Temperature control in cold-blooded animals|keep their blood temperature]] higher above that of the water surrounding them than other [[Chondrichthyes|cartilaginous fish]], with temperature differences recorded up to 15.6&nbsp;°C.<ref>[https://www.jstor.org/stable/1448302 Abstract] for S. D. Anderson, K. J. Goldman: “Temperature Measurements from Salmon Sharks, ''Lamna ditropis'', in Alaskan Waters”, ''Copeia'', Vol.&nbsp;2001, No.&nbsp;3, 2001-08-06</ref><ref>{{marinebio|id=379|name=Salmon shark, ''Lamna ditropis'' }}</ref><ref>[http://www.jbc.org/cgi/reprint/278/33/30741.pdf C. Larsen, H. Malte, R. E. Weber: “ATP-induced Reverse Temperature Effect in Isohemoglobins from the Endothermic Porbeagle Shark”], ''[[Journal of Biological Chemistry]]'' vol.&nbsp;278, issue&nbsp;33, 30741–30747, 2003-08-15</ref>  Among fish, blood temperature regulation only occurs in large, fast species – [[bluefin tuna]] and [[swordfish]] are  [[Osteichthyes|bony fish]]  with similar abilities.

==Species==
* †''[[Lamna attenuata]]'' <small>(Davis, 1888)</small>
* †''[[Lamna carinata]]'' <small>(Davis, 1888)</small>
* ''[[Lamna ditropis]]'' <small>[[Carl Leavitt Hubbs|C. L. Hubbs]] & [[William Irving Follett|Follett]], 1947</small> (salmon shark)
* †''[[Lamna hectori]]'' <small>(Davis, 1888)</small>
* †''[[Lamna marginalis]]'' <small>(Davis, 1888)</small>
* ''[[Lamna nasus]]'' <small>([[Pierre Joseph Bonnaterre|Bonnaterre]], 1788)</small> (porbeagle)
* †''[[Lamna quinquelateralis]]'' <small>(Cragin, 1894)</small>
* †''[[Lamna trigeri]]'' <small>(Coquand, 1860)</small>
* †''[[Lamna trigonata]]'' <small>(Agassiz, 1843)</small>

==See also==
* [[List of prehistoric cartilaginous fish]]

==References==
{{Reflist}}

{{Lamniformes}}
{{Taxonbar|from=Q137078}}
{{Authority control}}

[[Category:Lamna| ]]
[[Category:Danian first appearances]]
[[Category:Taxa named by Georges Cuvier]]
[[Category:Shark genera]]
[[Category:Extant Danian first appearances]]