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†Hadrosaurus cavatus Cope, 1871
†Ornithotarsus immanis Cope, 1869

Hadrosaurus /ˌhædrəˈsɔːrəs/; from Greek ἁδρός, hadros, meaning "bulky" or "large", and σαῦρος, sauros, meaning "lizard" is a valid genus of hadrosaurid dinosaur The only known skeleton was discovered in 1858, representing the first dinosaur species known from more than isolated teeth to be identified in North America In 1868, it became the first ever mounted dinosaur skeleton Hadrosaurus foulkii is the only species in this genus and has been the official state dinosaur of New Jersey, United States since 1991

H foulkii is known from a single specimen consisting of much of the skeleton and parts of the skull The specimen was collected from the Woodbury Formation in New Jersey, USA Using radio-isotope dating of bivalve shells from the same formation, the sedimentary rocks where the Hadrosaurus fossil was found were formed at some time between 805 and 785 million years ago


  • 1 Discovery and history
  • 2 Classification
  • 3 Paleoecology
  • 4 References
  • 5 External links

Discovery and history

A photo of the site where the fossils were found 2010

In 1838, John Estaugh Hopkins was digging in a marl pit on a small tributary of the Cooper River in Haddonfield, New Jersey, and part of the Campanian-age Woodbury Formation when he uncovered large bones, putting them on display at his home, also in Haddonfield In 1858, these bones sparked the interest of a visitor, William Parker Foulke The skeleton was dug out from the marl pit in 1858 by Foulke The excavation site, known as the Hadrosaurus foulkii Leidy site, is now a National Historic Landmark Foulke contacted paleontologist Joseph Leidy, and together they recovered an almost complete set of limbs, along with a pelvis, several part of the feet, 28 vertebrae including 18 from the tail, eight teeth and two small parts of the jaw Foulke and Leidy studied the fossils together, and in 1858, Leidy formally described and named Hadrosaurus foulkii in honor of his collaborator

Leidy recognized that these bones were from a dinosaur by their similarity to those of Iguanodon, discovered in England some decades before, but the skeleton of Hadrosaurus was far more complete Leidy's monograph Cretaceous Reptiles of the United States, describing Hadrosaurus more completely and with illustrations, was written in 1860, but the American Civil War delayed its publication until 1865

Benjamin Waterhouse Hawkins' mounted Hadrosaurus, the first mounted dinosaur skeleton in the world

Leidy reconstructed Hadrosaurus as a biped, in contrast to the view at the time that such dinosaurs were quadrupedal The entire skeleton was completely assembled in 1868 by a team including English sculptor and naturalist Benjamin Waterhouse Hawkins and was put on display at Philadelphia Academy of Natural Sciences It was the first-ever mounted dinosaur skeleton The skeleton is usually kept 'behind-the-scenes' in the Academy's collections However, from November 22, 2008 until April 19, 2009, a fully assembled cast of the skeleton and an exhibit about the science and culture surrounding the dinosaur's discovery was open to the public

Hadrosaurus was named the state fossil of New Jersey, designated in 1994 It is one of the most celebrated dinosaurs ever, and is of great historic importance

When the skeleton was first assembled, it was displayed with a plaster skull sculpted by Hawkins Many other artists have recreated Hadrosaurus with skulls from other, related species such as Gryposaurus and Brachylophosaurus A statue of Hadrosaurus, sculpted by Haddonfield resident John Giannotti, now stands in the center of the town of Haddonfield, commemorating its discovery there



Despite the fact that the family Hadrosauridae has Hadrosaurus as its type genus, the skeleton lacks a skull and was long viewed as too incomplete to compare to other hadrosaurs for classification purposes, leading most scientists to consider it a nomen dubium, or dubious name However, a re-evaluation of the fossil material in 2011 noted several distinct characteristics of the skeleton that could allow the genus Hadrosaurus and species H foulkii to remain in use as valid taxa

Hadrosaurus has also traditionally served as the basis for a large subfamily called Hadrosaurinae, which was seen as a group of largely crestless group of hadrosaurs related to the crested subfamily Lambeosaurinae However, the changing view of Hadrosaurus classification in relation to other hadrosaurs has led some scientists to rename these subfamilies In a 2008 study, Hadrosaurus was found to be more primitive than either lambeosaurines or other "hadrosaurines", and not a particularly close relative of classic "hadrosaurines" such as Edmontosaurus and Saurolophus As a result of this, the name Hadrosaurinae was restricted to Hadrosaurus alone, and the subfamily comprising the traditional "hadrosaurines" was renamed the Saurolophinae

Reconstructed skeleton, Academy of Natural Sciences Plates from Leidy's description

Below is a simplified cladogram recovered by Ramírez-Velasco et al in 2012 in their description of Huehuecanauhtlus This topology was recovered using an extensive sampling of 60 hadrosauroid species, and two outgroup taxa, which were scored based on 287 morphological traits, and included data from two recent redescriptions of Hadrosaurus by Prieto-Márquez et al 2006 and Prieto-Márquez 2011


Jinzhousaurus yangi

Fukuisaurus tetoriensis

Penelopognathus weishampeli

Equijubus normani

Probactrosaurus gobiensis

Eolambia caroljonesa

Protohadros byrdi

Tanius sinensis

Bactrosaurus johnsoni

Glishades ericksoni

Gilmoreosaurus mongoliensis

Huehuecanauhtlus tiquichensis

Jintasaurus meniscus

Tethyshadros insularis


Hadrosaurus foulkii


Acristavus gagslarsoni

Maiasaura peeblesorum

Brachylophosaurus canadensis

Shantungosaurus giganteus

Edmontosaurus annectens

Edmontosaurus regalis

Other saurolophines →


Aralosaurus tuberiferus

Jaxartosaurus aralensis

Tsintaosaurus spinorhinus

Pararhabdodon isonensis

Other lambeosaurines →

However, the latest phylogeny of the Hadrosauroidea indicates Hadrosaurus is definitely placed within the monophyletic group including all nonlambeosaurine hadrosaurids Therefore, the traditional Hadrosaurinae should be still valid for designating all non-lambeosaurine hadrosaurids


The holotype of Hadrosaurus was found in marine sediments, which suggests the skeleton was transported by a river and then deposited in the Cretaceous sea The Hadrosaurus remains all persist to the Woodbury Formation


  1. ^ a b c d e f Prieto-Marquez, A, Weishampel, DB and Horner, JR 2006 "The dinosaur Hadrosaurus foulkii, from the Campanian of the East Coast of North America, with a reevaluation of the genus" Acta Palaeontologica Polonica, 511: 77–98
  2. ^ "Hadrosaur" Oxford Dictionaries Oxford University Press Retrieved 2016-01-21 
  3. ^ "Hadrosaur" Merriam-Webster Dictionary Retrieved 2016-01-21 
  4. ^ Levins, Hoage "From the Shores of a Bucolic Pond to World Fame: Haddonfield's Dinosaur" Finding the World's First Dinosaur Skeleton: Hadrosaurus foulkii Retrieved 24 January 2011 
  5. ^ "hadrosaur" Online Etymology Dictionary 
  6. ^ ἁδρός Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
  7. ^ σαῦρος Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
  8. ^ a b c d Prieto-Márquez, A 2011 "Revised diagnoses of Hadrosaurus foulkii Leidy, 1858 the type genus and species of Hadrosauridae Cope, 1869 and Claosaurus agilis Marsh, 1872 Dinosauria: Ornithopoda from the Late Cretaceous of North America" Zootaxa 2765: 61–68  CS1 maint: Uses authors parameter link
  9. ^ Gallagher, WB 2005 "Recent mosasaur discoveries from New Jersey and Delaware, USA: stratigraphy, taphonomy and implications for mosasaur extinction" Netherlands Journal of Geosciences, 843: 241
  10. ^ Prieto-Márquez, A 2013 "Skeletal morphology of Kritosaurus navajovius Dinosauria:Hadrosauridae from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini" Journal of Systematic Palaeontology in press doi:101080/147720192013770417 
  11. ^ Ramírez-Velasco, A A; Benammi, M; Prieto-Márquez, A; Ortega, J S A; Hernández-Rivera, R; Sues, H D 2012 "Huehuecanauhtlus tiquichensis, a new hadrosauroid dinosaur Ornithischia: Ornithopoda from the Santonian Late Cretaceous of Michoacán, Mexico" Canadian Journal of Earth Sciences 49 2: 379–395 doi:101139/e11-062 
  12. ^ Xing, H; Wang, D; Han, F; Sullivan, C; Ma, Q; He, Y; Hone, D W E; Yan, R; Du, F; Xu, X 2014 "A New Basal Hadrosauroid Dinosaur Dinosauria: Ornithopoda with Transitional Features from the Late Cretaceous of Henan Province, China" PLoS ONE 9 6: e98821 doi:101371/journalpone0098821 PMC 4047018 PMID 24901454 

External links

  • Dinosaurs portal
  • Hadrosaur mummy
  • The discovery of H foulkii
  • Hadrosaurids on UCMP
  • New Jersey State Museum website
  • Joseph Leidy and Hadrodaurus foulkii at The Academy of Natural Sciences
  • Hadrosaurus foulkii exhibit at The Academy of Natural Sciences

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