What taxonomic feature distinguishes the genus *Xantusia* from the genus *Lepidophyma* within the Xantusiidae family?
Answer
*Xantusia* is endemic to the deserts of the United States
While both *Lepidophyma* and *Xantusia* belong to the Family Xantusiidae (night lizards), their primary distinction lies in their geographic distribution and associated habitat. The genus *Lepidophyma* is specialized for tropical regions, ranging from Mexico down to Panama. In contrast, the genus *Xantusia* is geographically restricted, being endemic specifically to the deserts of the United States. This distribution pattern highlights that *Lepidophyma* represents the tropical component of the night lizard lineage within the family. The third genus in the family, *Cricosaura*, is notable for being confined solely to Cuba.
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