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The small, green, spiny-tailed iguanids of Amazonian South America comprise a single polytypic species, including Uracentron azureum azureum in eastern Brazil and the Guayanan region, U. azureum guentheri in western Brazil and eastern Peru, and U. azureum werneri in eastern and central Colombia and southwestern Venezuela. The hemipenis is very similar to that of another tropidurine, Plica plica. Uracentron azureum is diurnal, arboreal, and eats mainly ants. A clutch consists of one or two relatively large eggs. Antipredator behavior includes climbing, biting, and lashing the tail. A specimen from near the Brazilian border in Vaupés documents the occurence of Uracentron flaviceps in east-central Colombia and sympatry with U. azureum.
Herpetologica © 1977 Herpetologists' League