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Chelydra is one of the two extant genera of the Chelydridae family
of turtles, the other being Macrochelys.Turtles are reptiles of the
order Testudines (the crown group of the superorder Chelonia),
characterised by a special bony or cartilaginous shell developed
from their ribs that acts as a shield.The order Testudines includes
both extant (living) and extinct species. The earliest known
turtles date from 215 million years agomaking turtles one of the
oldest reptile groups and a more ancient group than lizards, snakes
and crocodiles. Of the many species alive today, some are highly
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