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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 .
[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.
Most of these tortoises were wiped out by human arrival. Many of these giant tortoises are not closely related (belonging to different genera such as Megalochelys, Chelonoidis, Centrochelys, Aldabrachelys, Cylindraspis, and Hesperotestudo), but are thought to have independently evolved large body size through convergent evolution.
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