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Odontochelys semitestacea (meaning "toothed turtle with a half-shell") is a Late Triassic relative of turtles. Before Pappochelys was discovered it was considered the oldest undisputed stem turtle. It is the only known species in the genus Odontochelys and the family OdontochelyidaeO. semitestacea was first described from three 220-million-year-old specimens excavated in Triassicdeposits in Guizhou, China.

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