The serrated hinged terrapin (Pelusios sinuatus) is a species of turtle in the family Pelomedusidae.

[1] The preferred natural habitats of P. sinuatus are tropical lakes and rivers, where it can often be seen basking on logs, rocks, or mud banks, or even on the backs of sleeping hippopotami.

[2] The largest species in the genus Pelusios, P. sinuatus has a straight carapace length of up to 55 cm (22 in).

[2] For defence, the hinged plastron of P. sinuatus closes to protect the head and forelimbs.

[2] The female serrated hinged terrapin lays seven to 25 eggs, up to 500 m (1,600 ft) from the nearest water, in October to January.