Greenland shark

The Greenland shark is a large, slow-moving shark of the North Atlantic and Arctic that inhabits deep, cold waters and can live for centuries.

Somniosidae: Somniosidae is the family of deep-water sharks known as sleeper sharks. The Greenland shark is a member of this family of slow-moving deep-water sharks.
Shark longevity: Shark longevity is the variation in lifespan among shark species, including exceptionally long-lived deep-water forms. The Greenland shark is a leading example of extreme lifespan among vertebrates.
Age determination in fish: Age determination in fish uses anatomical or chemical records to estimate an individual's age. The Greenland shark provides a rare test case for aging long-lived fishes.
Pacific sleeper shark: The Pacific sleeper shark is a large deep-water shark found in the North Pacific. It is a close ecological counterpart in another cold northern ocean.
Cartilaginous fish: Cartilaginous fish are vertebrates whose skeletons are made primarily of cartilage. Its shark anatomy belongs to this broader vertebrate group.
Radiocarbon dating: Radiocarbon dating estimates the age of carbon-containing material from its radioactive carbon-14 content. Dating proteins in the eye lens helped estimate the shark's age.
Arctic marine ecology: Arctic marine ecology studies organisms and interactions in the seas surrounding the Arctic. Its movements and feeding connect it to Arctic food webs.
Great white shark: The great white shark is a large, active predatory shark found in temperate and subtropical seas. Its energetic hunting lifestyle contrasts with the Greenland shark's slow pace.
Cold-water adaptation: Cold-water adaptation comprises biological traits that enable organisms to function in low temperatures. Its physiology supports life in Arctic and North Atlantic waters.
Eye lens: The eye lens is the transparent structure that focuses light onto the retina. Its metabolically stable lens tissue preserves carbon used in age estimates.

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