1.
A critically endangered sea turtle belonging to the family Cheloniidae. It is the only species in its genus.
2.
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One of four living species of the order Sirenia. It is the only living representative of the once-diverse family Dugongidae.
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It is the only species in the genus Chelonia. Its range extends throughout tropical and subtropical seas around the world.
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Believed to have been extinct since the end of the Cretaceous period. More closely related to tetrapods than even the ray-finned fish, coelacanths were considered the "missing link" between the fish and the tetrapods until the first Latimeria specimen.
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