Dinilysia is an extinct genus of snake from the Late Cretaceous (Coniacian) of South America. It comes from the family Dinilysiidae.
The snake reached a length of 6-10 feet (1.8-3 meters) and preyed on smaller animals. The shape of the animal's skull does not support the suggestion that snakes were burrowers during their ancestry; it is clear that Dinilysia was terrestrial.
In The Land Before Time
Though D. patagonica did not make its way into any of the films in their complete states, it did appear in a deleted scene for the original film, titled "Littlefoot and the Snake". It is shown antagonizing a young Littlefoot. It is ultimately defeated by Littlefoot's mother.
- The Dinilysia in the storyboards resembles Kaa from the 1967 animated film The Jungle Book to a degree.