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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 .
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.
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 ...
† Megalochelys Falconer, H. and Cautley, P.T. 1837. [47] † Megalochelys atlas, Atlas tortoise, Extinct – Pliocene to Pleistocene † Megalochelys cautleyi, Cautley's giant tortoise; Tent tortoise (Psammobates tentorius) †Titanochelon perpiniana Psammobates Fitzinger 1835:113 [38] Psammobates geometricus, geometric tortoise
[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.
The subspecies was heavily exploited and eliminated over much of its original range. Trampling of nests by feral donkeys, and the predation of hatchlings by feral dogs decimated populations, but the breeding program has led to successful releases.
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The saddle-backed Rodrigues giant tortoise was an exceptionally tall species of giant tortoise, with a long, raised neck and an upturned carapace, which gave it a giraffe-like body shape almost similar to that of a sauropod dinosaur.
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