Advances in both morphological and molecular techniques have uncovered many lineages across the tree of life, and Neotropical vertebrates are no exception. Sphaerodactylus geckos (Sphaerodactylidae) are abundant and important components of the Neotropical herpetofauna, but few studies have thoroughly investigated them using a combination of morphology and modern molecular genetic methods. Here, we combine morphological and genetic data to describe a new species of Sphaerodactylus from the northwestern karst region of Puerto Rico. The new species is compared to other closely related and sympatric species of Sphaerodactylus. Morphological analysis shows that the combination of small body size (median SVL = 21.5 mm), lepidosis, skull morphology, and coloration of the head differentiates the new species from its closest relatives, including the related species, Sphaerodactylus klauberi. Comparing sequences of the mitochondrial 16S rRNA gene showed a genetic distance between S. klauberi and the new species of 5.1–5.6%, which is similar to genetic distances among other recognized gecko species. This is the first new species of Sphaerodactylus to be described from Puerto Rico in nearly a century, highlighting the continued need to evaluate and chronicle biological diversity even in well-studied regions.

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