Turtles are reptiles characterised by a special bony or cartilaginous shell developed from their ribs and acting as a shield. Tortoises are a family, Testudinidae, of land-dwelling vertebrates. Tortoises are shielded from predators by a shell.
Carbonemys lived 5 million years after the mass extinction event of many species of dinosaurs. It had a shell that measured about 1.72 metres (5 ft 8 in), making it one of the world's largest turtles.