Odontochelys semitestacea is currently the oldest known
species of turtle.
It lived in the
about 220 million years ago - in shallow marine environments -
been found in
Odontochelys had a number of primitive features that distinguish
it from modern turtles. These include teeth in its upper and lower
jaws (modern turtles have a beak and no teeth), and only the lower
half (the "plastron") of a turtle's armor. It also had
an elongated skull and tail.
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