| Hypacrosaurus Temporal range: Late Cretaceous,
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| H. altispinus fossil at the Royal Tyrrell Museum | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Neornithischia |
| Clade: | †Ornithopoda |
| Family: | †Hadrosauridae |
| Subfamily: | †Lambeosaurinae |
| Tribe: | †Lambeosaurini |
| Genus: | †Hypacrosaurus Brown, 1913 |
| Type species | |
| †Hypacrosaurus altispinus Brown, 1913
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| Other species | |
| Synonyms | |
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Hypacrosaurus (meaning "near the highest lizard" [Greek υπο-, hypo- = less + ακρος, akros, high], because it was almost but not quite as large as Tyrannosaurus)[1][2] was a genus of duckbill dinosaur similar in appearance to Corythosaurus. Like Corythosaurus, it had a tall, hollow rounded crest, although not as large and straight. It is known from the remains of two species that spanned 75 to 67 million years ago,[3] in the Late Cretaceous of Alberta, Canada, and Montana, United States, and is the latest hollow-crested duckbill known from good remains in North America. It was an obscure genus until the discovery in the 1990s of nests, eggs, and hatchlings belonging to H. stebingeri.
- ^ Brown, Barnum (1913). "A new trachodont dinosaur, Hypacrosaurus, from the Edmonton Cretaceous of Alberta". Bulletin of the American Museum of Natural History. 32 (20): 395–406. hdl:2246/1416. Retrieved 2007-05-02.
- ^ Creisler, Benjamin S. (2007). "Deciphering duckbills". In Carpenter Kenneth (ed.). Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Bloomington and Indianapolis: Indiana University Press. pp. 185–210. ISBN 978-0-253-34817-3.
- ^ Arbour, V.M.; Burns, M. E.; Sissons, R. L. (2009). "A redescription of the ankylosaurid dinosaur Dyoplosaurus acutosquameus Parks, 1924 (Ornithischia: Ankylosauria) and a revision of the genus". Journal of Vertebrate Paleontology. 29 (4): 1117–1135. Bibcode:2009JVPal..29.1117A. doi:10.1671/039.029.0405. S2CID 85665879.