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Abstract
We studied a population of Tropidurus spinulosus, an arboreal lizard species from the dry chaco of Salta, Argentina. This species is reproducing seasonally. Females are reproductively active from November to January, whereas males are October through December. More than a clutch per cycle could be laid. Clutch size was 5.0 and is positively correlated to snout-vent length. Reproductive characteristics are similar to other Tropidurus species. Arboreality and environmental adaptations are proximal interpretations of the species-specific reproductive biology in this lizard.