Genyodectes, meaning “jaw biter”, is a genus of theropod dinosaur from the Early Cretaceous Period (Aptian stage) of South America. It was collected from the Cañadón Grande, Departamento Paso de Indios in the Chubut Province of Argentina. The remains consisted of an incomplete snout, portions of the jawbone, teeth, and a few other skull bones. These remains were poorly preserved, but were articulated as a new genus.

The type species, G. serus, is the only known of the genus. It was first described in 1901 by Sir Arthur S. Woodward as the second non-avian dinosaur to be found in South America. It was the most complete South American theropod until the 1970s.

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