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Danian to Present | image = Lamna nasus noaa.jpg | image_caption = Porbeagle (''L. nasus'') | image_width = 240px | image2 = Lamna ditropis.jpg | image2_caption = Salmon shark (''L. ditropis'') | image2_width = 240px | regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | subclassis = Elasmobranchii | superordo = Selachimorpha | ordo = Lamniformes | familia = Lamnidae | genus = ''Lamna'' | genus_authority = Cuvier, 1816 | type_species = ''Squalus cornubicus'' | type_species_authority = Bloch and Schneider, 1801 | 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.〔(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〕〔(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〕 Among fish, blood temperature regulation only occurs in large, fast species – bluefin tuna and swordfish are bony fish with similar abilities. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lamna」の詳細全文を読む スポンサード リンク
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