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Platysternidae (big-headed turtles; order Chelonia, suborder Cryptodira) A monospecific family (Platysternon megacephalum) consisting of turtles found in mountain brooks in south-east Asia. They are aquatic carnivores but often travel over land. The jaws are serrated, the head is too large to withdraw into the shell, the carapace is flattened, and the tail is long and plated.

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