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Testudines
Turtles
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characterised by a special bony or cartilaginous shell developed from their ribs that acts as a shield.

Like other reptiles, turtles are ectotherms—their internal temperature varies according to the ambient environment, commonly called cold-blooded. However, leatherback sea turtles have noticeably higher body temperature than surrounding water because of their high metabolic rate.

Like other amniotes (reptiles, dinosaurs, birds, and mammals), they breathe air and do not lay eggs underwater, although many species live in or around water. The largest turtles are aquatic.

Testudines :
Cryptodira
Pleurodira

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Testudines
Turtles
Eureptilia
True Reptiles
Reptilia
Reptiles
Tetrapoda
Four Legs
Gnathostomata
Jaws
Vertebrata
Vertibrates
Chordata
Chords
Deuterostomia
Mouth Second
Bilateria
Two-Way Symmetry
Eumetazoa
True Higher Animals
Animalia
Animals
Eukaryota
Eukaryota
Cells with a Nucleus

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