Xenotosuchus is an extinct genus of mastodonsaurid temnospondyl within the family Mastodonsauridae known from the Triassic of South Africa.

The genus is based on a skull originally described as Parotosuchus, an animal which it resembled in general build and habit.

Its amphibian life history meant that the distinct shape of the skull roof would change from a generalized tadpole-like skull type through to the distinct adult shape.

Contrary to related forms like Mastodonsaurus, the tusks of the lower jaw were of moderate size and did not penetrate the premaxilla.

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