Review and images by Alopias superciliosus; edited by bmathison1972
The Greenland Shark (Somniosus microcephalus) is the largest of the Sleeper Sharks (family Somniosidae), and one of the largest extant species of sharks, attaining lengths of up to 23 ft (7 m) and weighing up to 3,090 lbs (1,400 kg).