A late Cretaceous era hadrosaur, Willinakaqe was described from a collection of disarticulated remains of several individuals. Although no single individual was complete, the numbers of Willinakaqe involved at least allowed missing elements of one individual to be covered by others, allowing for a more confident reconstruction of this dinosaur. Willinakaqe has been classified as a saurolophine hadrosaurid because of the lack of a hollow head crest, something that is the hallmark of the lambeosaurine hadrosaurids. This ties in with the common observation that as the Cretaceous period came to a close, most lambeosaurine hadrosaurids had been replaced by saurolophine hadrosaurids. Willinakaqe is generally considered to be closely related to Secernosaurus, the first hadrosaurid dinosaur to be identified as living in South America.
As a relatively large herbivorous dinosaur, Willinakaqe would have been a viable target for large late Cretaceous period predators such as Carnotaurus.
As a relatively large herbivorous dinosaur, Willinakaqe would have been a viable target for large late Cretaceous period predators such as Carnotaurus.
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