Microlophus bivittatus, the San Cristóbal lava lizard, is a species of lava lizard endemic to San Cristóbal Island in the Galápagos Islands. The species is commonly attributed to the genus Microlophus but has been attributed to the genus Tropidurus. They are currently under threat by invasive cats on the island. The lizard is also closely related to the Microlophus occipitalis which radiated off of the bivittatus.

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