Checklist of marine and estuarine fishes from the Alaska-Yukon Border, Beaufort Sea, to Cabo San Lucas, Mexico Author Love, Milton S. 0000-0003-0981-0061 love@lifesci.ucsb.edu Author Bizzarro, Joseph J. 0000-0002-2412-9357 joe.bizzarro@noaa.gov Author Cornthwaite, Maria 0000-0002-1528-3272 maria.cornthwaite@dfo-mpo.gc.ca Author Frable, Benjamin W. 0000-0003-4525-0671 bfrable@ucsd.edu Author Maslenikov, Katherine P. 0000-0003-0981-0061 love@lifesci.ucsb.edu text Zootaxa 2021 2021-10-19 5053 1 1 285 journal article 2792 10.11646/zootaxa.5053.1.1 75ffcff3-6336-4f6a-8d0b-94c082519099 1175-5326 5578008 295D03A4-589A-4E3F-B030-5121EF7D7398 Hexanchus griseus (Bonnaterre, 1788) . Bluntnose Sixgill Shark , Mud Shark, or Sixgill Shark. Confirmed to 4.82 m ( 15.8 ft ), and probably to 5.5 m ( 18 ft ) ( Ebert et al. 2013 ). The 6 m ( 19.7 ft ) reference ( Roberts et al. 2015 ) is undocumented and appears to be based on the maximum possible size estimated from a partial specimen ( Celona et al. 2005 ). Circumglobal in temperate and tropical waters; western Pacific Ocean north to southern Japan (Nakaya and Shirai in Masuda et al. 1984 ); eastern North Pacific Ocean south of Aleutian Islands ( Larkins 1964 ) to Gulf of California (Allen and Robertson 2015 ) to Chile ( Chirichigno and Vélez 1998 ), including Islas Galápagos ( Buglass et al. 2020 ). Depth: surface to at least 2,490 m ( 8,167 ft ) (min.: Compagno 1984 ; max.: Weigman 2016). The modifier bluntnose was added to the common name by Compagno (1999) ; there are two species of sixgill shark, although only one occurs in our area.