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. doi:10.1671/039.029.0405. S2CID 85665879.
described as transitional between the earlier Lambeosaurus and later Hypacrosaurus. Hypacrosaurus was a lambeosaurine hadrosaurid, and has been recognized as such...
lambeosaurine, thus related to Lambeosaurus, Nipponosaurus, Velafrons, Hypacrosaurus, and Olorotitan. Corythosaurus has an estimated length of 7.7–9 metres...
found in slightly older rocks, as well as the less well-known genera Hypacrosaurus and Olorotitan. All had unusual crests, which are now generally assumed...
form in between Lambeosaurus and Hypacrosaurus; in 1994 he would name it Hypacrosaurus stebingeri. Today, Hypacrosaurus stebingeri is no longer seen as...
occurred at different times in the growth of different species; in Hypacrosaurus stebingeri it did not occur until a nearly adult stage, whereas in a...
the lambeosaurines, distinct from the helmet-crested Corythosaurus, Hypacrosaurus, and Lambeosaurus. Its closest known relative appears to be Charonosaurus...
of hadrosaurids, referable to the genus Hypacrosaurus, coexisted with Maiasaura for some time, as Hypacrosaurus remains have been found lower in the Two...
permanently hinder plant growth. Animals such as the Chasmosaurus, Hypacrosaurus, Troodon, and Edmontosaurus may have all migrated north to take advantage...
the Saurolophinae. At the time, this also included Corythosaurus and Hypacrosaurus, the only well-known examples of what would become the Lambeosaurinae...
species of Lambeosaurus, suggested it could instead be a species of Hypacrosaurus, or questioned its validity. In 2012 it was named as a separate genus...
also been reported for both of these fossils, along with a specimen of Hypacrosaurus. In 2015, Sergio Bertazzo and colleagues reported the preservation of...
Dinosaur Provincial Park. Some of the specimens, from left to right, are Hypacrosaurus, Edmontosaurus, Lambeosaurus, Gorgosaurus (both in the background),...
through a phylogenetic analysis that it was closest to Corythosaurus and Hypacrosaurus. As a hadrosaurid, Olorotitan would have been a bipedal/quadrupedal...
large dinosaurs like the ceratopsid Centrosaurus and the hadrosaur Hypacrosaurus. In some areas, Daspletosaurus coexisted with another tyrannosaurid...
America, while lambeosaurines were rare, consisting of a few species like Hypacrosaurus, and albertosaurines and centrosaurines had gone extinct. However, in...
cerebral volume was only 30% in Amurosaurus, significantly lower than in Hypacrosaurus, closer to that of theropods like Tyrannosaurus, though still distinctly...
ovatus included the basal ornithopod Orodromeus, hadrosaurids (such as Hypacrosaurus, Maiasaura, and Prosaurolophus), the centrosaurines Brachyceratops and...
Global Information
