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Xenosauridae (xenosaurs, crocodile lizards; order Squamata, suborder Sauria) A family of robust lizards which enter water readily. They have a mixture of large and small scales. The family comprises the xenosaurs, three species of crepuscular insect-eaters from the rain forests of Central America, and a single species from China, Shinisaurus crocodilurus (crocodile lizard) which feeds on fish.