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Megalochelys ("great turtle") is an extinct genus of tortoises that lived from the Miocene to Pleistocene. They are noted for their giant size, the largest known for any tortoise, with a maximum carapace length of over 2 m (6.5 ft) in M. atlas .
Both Megalochelys and Titanochelon reached sizes substantially greater than modern giant tortoises, with up to 2.4 m (7 ft 10 in) and 2 m (6 ft 7 in) shell lengths respectively. The phenomenon of animal species evolving in cache to unusually large size on islands (in comparison to continental relatives) is known as island gigantism or insular ...
[106] [107] The tortoise Megalochelys, of the Pleistocene epoch from what is now Pakistan and India, was even larger, at nearly 2.7 m (9 ft) in shell length [108] and 0.8–1.0 t (1,800–2,200 lb). [109] The Arrau turtle (Podocnemis expansa) is the largest of the side-necked turtles.
[30] [31] The largest known terrestrial tortoise was Megalochelys atlas, an animal that probably weighed about 1,000 kg (2,200 lb). [32] Some earlier aquatic Testudines, e.g. the marine Archelon of the Cretaceous [33] and freshwater Stupendemys of the Miocene, were considerably larger, weighing more than 2,000 kg (4,400 lb). [34]
The Seychelles giant tortoise (Aldabrachelys gigantea hololissa), also known as the Seychelles domed giant tortoise, is a tortoise subspecies in the genus Aldabrachelys.. It inhabited the large central granitic Seychelles islands, but was hunted in vast numbers by European sailors.
The Santiago Island giant tortoise (Chelonoidis niger darwini), also known commonly as the Santiago giant tortoise [3] and the James Island tortoise, is a subspecies of Galápagos tortoise in the family Testudinidae.
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Archelon is an extinct marine turtle from the Late Cretaceous, and is the largest turtle ever to have been documented, with the biggest specimen measuring 4.6 m (15 ft) from head to tail and 2.2–3.2 t (2.4–3.5 short tons) in body mass.