Allosauroids were common Jurassic–Cretaceous megapredators that disappeared in the Late Cretaceous faunal turnover. Here, Zanno and Makovicky describe Siats meekerorum, a giant new North American allosauroid from the Late Cretaceous, demonstrating that this clade co-occurred with and competitively excluded smaller tyrannosaurs.
- Lindsay E. Zanno
- Peter J. Makovicky
