a lambeosaurine hadrosaurid (duck-billed) dinosaur from the Late cretaceous of Canada.
Nearly the highest ranked lizard
(Nearly the highest ranked lizard, with high spines)Etymology
is derived from the Greek "Hypakros" ("nearly the highest [in rank], close to the top, close to first) and "sauros" (lizard). Barnum Brown described Hypacrosaurus
as "the largest of all known Trachodonts, approaching in size the great carnivorous dinosaur Tyrannosaurus
", meaning it was nearly equal to Tyrannosaurus rex
—the "king" of the tyrant lizards—in rank.
The species epithet
means "high-spined" and refers to the tall, spines protruding from the top of its vertebrae.
The first fossils of Hypacrosaurus
were discovered in the
Horseshoe Canyon Formation, near Tolman Ferry, Alberta, Canada, by Barnum Brown in 1910.
(AMNH 5204) consists of a partial pelvis and some vertebrae.
: Late Cretaceous
: 71-66 mya
Est. max. length
: 10 meters
Est. max. hip height
: 3 meters
Est. max. weight
: 2 tons
, based on MOR 549, was discovered at Badger Creek, in the Two Medicine Formation of Glacier County, Montana.
• Brown, Barnum (1913) "A new trachodont dinosaur, Hypacrosaurus, from the Edmonton Cretaceous of Alberta
". Bulletin of the AMNH, version 32, article 20.
• Lambe, Lawrence M. (1917) "On Cheneosaurus tolmanensis, a new genus and species of trachodont dinosaur from the Edmonton Cretaceous of Alberta
". The Ottowa Naturalis, Vol.XXX, No.10.
• D.B. Weishampel, P.M. Barrett, R.A. Coria, J. Le Loueff, Xu Xing, Zhao Xijin, A. Sahni, E.M.P. Gomani and C.N. Noto (2004) "Dinosaur distribution" in Weishampel, Dodson and Osmólska (eds.) "The Dinosauria: Second Edition
• Horner JR and Currie PJ (1994) "Embryonic and neonatal morphology and ontogeny of a new species of Hypacrosaurus
(Ornithischia, Lambeosauridae) from Montana and Alberta" in Carpenter, Hirsch and Horner (eds.) "Dinosaur Eggs and Babies". Cambridge University Press. pp. 312–336.
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