Mounted skeleton of Edmontosaurus annectens, Oxford University Museum
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Clade:
Dinosauria
Clade:
†Ornithischia
Clade:
†Ornithopoda
Clade:
†Hadrosauromorpha
Family:
†Hadrosauridae Cope, 1869
Type species
†Hadrosaurus foulkii
Leidy, 1858
Subgroups
†Aquilarhinus
†Eotrachodon
†?Fylax
†?Gobihadros
†Hadrosaurus
†Lapampasaurus
†Latirhinus
†?Lophorhothon
†Malefica
†?Penelopognathus
†?Plesiohadros
†Yamatosaurus
†Euhadrosauria/Saurolophidae
†Lambeosaurinae
†Saurolophinae
Synonyms
Trachodontidae(Lydekker, 1888)
Saurolophidae(Brown, 1914)
Lambeosauridae(Parks, 1923)
Cheneosauridae(Lull & Wright, 1942)
Ornithotarsidae(Cope, 1871)
Hadrosaurids (from Ancient Greek ἁδρός (hadrós) 'stout, thick', and σαύρα (saúra) 'lizard'), or duck-billed dinosaurs, are members of the ornithischian family Hadrosauridae. This group is known as the duck-billed dinosaurs for the flat duck-bill appearance of the bones in their snouts. The ornithopod family, which includes genera such as Edmontosaurus and Parasaurolophus, was a common group of herbivores during the Late Cretaceous Period.[1] Hadrosaurids are descendants of the Late Jurassic/Early Cretaceous iguanodontian dinosaurs and had a similar body layout. Hadrosaurs were among the most dominant herbivores during the Late Cretaceous in Asia and North America, and during the close of the Cretaceous several lineages dispersed into Europe, Africa, and South America.
Like other ornithischians, hadrosaurids had a predentary bone and a pubic bone which was positioned backwards in the pelvis. Unlike more primitive iguanodonts, the teeth of hadrosaurids are stacked into complex structures known as dental batteries, which acted as effective grinding surfaces. Hadrosauridae is divided into two principal subfamilies: the lambeosaurines (Lambeosaurinae), which had hollow cranial crests or tubes; and the saurolophines (Saurolophinae), identified as hadrosaurines (Hadrosaurinae) in most pre-2010 works, which lacked hollow cranial crests (solid crests were present in some forms). Saurolophines tended to be bulkier than lambeosaurines. Lambeosaurines included the aralosaurins, tsintaosaurins, lambeosaurins and parasaurolophins, while saurolophines included the brachylophosaurins, kritosaurins, saurolophins and edmontosaurins.
Hadrosaurids were facultative bipeds, with the young of some species walking mostly on two legs and the adults walking mostly on four.[2][3]
^Case, Judd A.; Martin, James E.; Chaney, Dan S.; Regurero, Marcelo; Marenssi, Sergio A.; Santillana, Sergio M.; Woodburne, Michael O. (25 September 2000). "The first duck-billed dinosaur (family Hadrosauridae) from Antarctica". Journal of Vertebrate Paleontology. 20 (3): 612–614. doi:10.1671/0272-4634(2000)020[0612:tfdbdf]2.0.co;2. hdl:11336/105444. JSTOR 4524132. S2CID 131243139.
^Dilkes, David W. (2001). "An ontogenetic perspective on locomotion in the Late Cretaceous dinosaur Maiasaura peeblesorum (Ornithischia: Hadrosauridae)". Canadian Journal of Earth Sciences. 38 (8): 1205–1227. doi:10.1139/e01-016.
^Fiorillo, A.R.; Tykoski, R.S. (2016). "Small hadrosaur manus and pes tracks from the Lower Cantwell Formation (Upper Cretaceous) Denali National Park, Alaska: implications for locomotion in juvenile hadrosaurs". PALAIOS. 31 (10): 479–482. Bibcode:2016Palai..31..479F. doi:10.2110/palo.2016.049. S2CID 132975678.
or duck-billed dinosaurs, are members of the ornithischian family Hadrosauridae. This group is known as the duck-billed dinosaurs for the flat duck-bill...
Struthiomimus, Ornithopoda, ?Chasmosaurus, ?Corythosaurus, Hadrosaurinae, Hadrosauridae, and Ceratopsidae. When Parasaurolophus existed, the Fruitland Formation...
phylogenetic relationship of Edmontosaurus and Shantungosaurus (Dinosauria: Hadrosauridae) from the Upper Cretaceous of North America and East Asia". Acta Geologica...
refer to: Platypus, Ornithorhynchus anatinus Duckbill dinosaurs, family Hadrosauridae Duckbill fishes, family Percophidae Duckbill eels, family Nettastomatidae...
the most robust among hadrosaurs. Despite the fact that the family Hadrosauridae has Hadrosaurus as its type genus, the skeleton lacks a skull and was...
first specimens, put it in its own subfamily in "Trachodontidae" (=Hadrosauridae), the Saurolophinae. At the time, this also included Corythosaurus and...
batteries) †Hadrosauromorpha (hadrosaurids and their closest relatives) †Hadrosauridae ("duck-billed dinosaurs"; often with crests) †Saurolophinae (hadrosaurids...
Under this view, the traditional Hadrosaurinae is resurrected, with the Hadrosauridae being divided into two clades: Hadrosaurinae and Lambeosaurinae. Saurolophinae...
phylogenetic analysis which recovered Malefica as a basal member of the Hadrosauridae, outside the clade Saurolophidae (=Euhadrosauria), which contains the...
Brachylophosaurus, and Maiasaura. However, the most recent review of Hadrosauridae, by Jack Horner and colleagues (2004), came to a noticeably different...
subdivided the order into three families: Camptonotidae, Iguanodontidae, and Hadrosauridae; the former was a new name, whereas the latter two were carried over...
Guenther, M. and Lucas, S.G. (2009). "The first lambeosaurin (Dinosauria, Hadrosauridae, Lambeosaurinae) from the Upper Cretaceous Ojo Alamo Formation (Naashoibito...
is an extinct genus of herbivorous ornithopod dinosaur belonging to Hadrosauridae, which lived in the area of modern Argentina during the Campanian and...
ornithischian dinosaurs that includes the "duck-billed" dinosaurs, or hadrosauridae, and all dinosaurs more closely related to them than to Iguanodon. Their...
Dinosaur Park Formation of Alberta; too fragmentary to assign beyond Hadrosauridae) As a hadrosaurid, Trachodon would have been a large, bipedal/quadrupedal...
contents within a specimen of Brachylophosaurus canadensis (Dinosauria: Hadrosauridae) from the Upper Cretaceous Judith River Formation of Montana". PALAIOS...
Hillary C. (2021-03-01). "First occurrence of Maiasaura (Dinosauria, Hadrosauridae) from the Upper Cretaceous Oldman Formation of southern Alberta, Canada"...
Horner, John R.; Weishampel, David B.; Forster, Catherine A (2004). "Hadrosauridae". In Weishampel, David B.; Dodson, Peter; Osmólska Halszka (eds.). The...
Maastrichtian) of Alberta, dominated by cf. Edmontosaurus regalis (Ornithischia: Hadrosauridae), with significant remains of Pachyrhinosaurus canadensis (Ornithischia:...
Bardet, N.; Jalil, N.-E. (2024). "A new small duckbilled dinosaur (Hadrosauridae: Lambeosaurinae) from Morocco and dinosaur diversity in the late Maastrichtian...
Heterodontosauridae †Family Hypsilophodontidae †Family Iguanodontidae * †Family Hadrosauridae The following is based on the second edition of The Dinosauria, a compilation...
referred to Corythosaurus as a member of the family Trachodontidae (now Hadrosauridae). Inside Trachodontidae were the subfamilies Trachodontinae and Saurolophinae...
(2011). "Cranial Growth and Variation in Edmontosaurs (Dinosauria: Hadrosauridae): Implications for Latest Cretaceous Megaherbivore Diversity in North...
photo caption in a book by Stephen Czerkas. Horner, an expert on the Hadrosauridae family, had less affinity for other kinds of dinosaurs. In 1987 and...
considered an invalid nomen dubium. The family is now known as the Hadrosauridae. Among its relatives, Nagao thought it was possibly closest to the taxa...
regularly called "mummies" were found in North America and belong to the Hadrosauridae ("duck-billed dinosaurs"), and are therefore also known as "hadrosaur...
Horner, John R.; Weishampel, David B.; Forster, Catherine A. (2004). "Hadrosauridae". In Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (eds.)....
; Evans, David C., eds. (2015). "Paleopathology in Late Cretaceous Hadrosauridae from Alberta, Canada". Hadrosaurs. Indiana University Press. pp. 540–571...
existence as a natural grouping. Tsintaosaurini is part of the family Hadrosauridae, specifically the subfamily Lambeosaurinae. The existence of a tsintaosaur...
Global Information
