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'''Ornithopods''' ({{pronEng|ɔrˈnɪθoʊpɒd}}) are a group of [[ornithischia|bird-hipped]] [[dinosaur]]s that started out as small, [[bipedal]] [[cursorial|running]] grazers, and grew in size and numbers until they became one of the most successful groups of [[herbivore]]s in the [[Cretaceous]] world, and dominated the [[North America]]n landscape. Their major evolutionary advantage was the progressive development of a chewing apparatus that became the most sophisticated ever developed by a [[reptile]], rivaling that of modern [[mammal]]s like the domestic [[cow]]. They reached their apex in the [[hadrosaur|duck-bill]]s, before they were wiped out by the [[Cretaceous-Tertiary extinction event]] along with all other non-[[aves|avian]] [[dinosaur]]s. Members are known from all seven [[continent]]s, although the [[Antarctic]] remains are unnamed, and they are generally rare in the [[Southern Hemisphere]].
'''Ornithopods''' ({{pronEng|ɔrˈnɪθoʊpɒd}}) are a group of [[ornithischia|bird-hipped]] [[dinosaur]]s that started out as small, [[bipedal]] [[cursorial|running]] grazers, and grew in size and numbers until they became one of the most successful groups of [[herbivore]]s in the [[Cretaceous]] world, and dominated the [[North America]]n landscape. Their major evolutionary advantage was the progressive development of a chewing apparatus that became the most sophisticated ever developed by a [[reptile]], rivaling that of modern [[mammal]]s like the domestic [[cow]]. They reached their apex in the [[hadrosaur|duck-bill]]s, before they were wiped out by the [[Cretaceous-Tertiary extinction event]] along with all other non-[[aves|avian]] [[dinosaur]]s. Members are known from all seven [[continent]]s, although the [[Antarctic]] remains are unnamed, and they are generally rare in the [[Southern Hemisphere]].
[[Image:Hadrosauroids.jpg|thumb|left|Ornithopod heads.]]

'''Ornithopoda''' ({{pronEng|ɔrnɨˈθɒpədə}}) means "bird [[Foot|feet]]", from the [[Greek language|Greek]] ''ornis'' ("bird") and ''pous'' ("feet"); this refers to their characteristic three-[[toe]]d feet, although many early forms retained four toes. They were also characterized by having no armor, the development of a horny [[beak]], an elongated [[pubis (bone)|pubis]] that eventually extended past the [[ilium (bone)|ilium]], and a missing hole in the lower [[jaw]].
'''Ornithopoda''' ({{pronEng|ɔrnɨˈθɒpədə}}) means "bird [[Foot|feet]]", from the [[Greek language|Greek]] ''ornis'' ("bird") and ''pous'' ("feet"); this refers to their characteristic three-[[toe]]d feet, although many early forms retained four toes. They were also characterized by having no armor, the development of a horny [[beak]], an elongated [[pubis (bone)|pubis]] that eventually extended past the [[ilium (bone)|ilium]], and a missing hole in the lower [[jaw]].


Revision as of 23:32, 16 April 2008

Ornithopods
Various ornithopod dinosaurs.
Far left: Camptosaurus, left: Iguanodon, centre background: Shantungosaurus, centre foreground: Dryosaurus, right: Corythosaurus, far right (small): Heterodontosaurus, far right (large): Tenontosaurus.
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Sauropsida
Superorder:
Dinosauria
Order:
Ornithischia
Suborder:
Cerapoda
Infraorder:
Ornithopoda

Marsh, 1881
Families

Ornithopods (Template:PronEng) are a group of bird-hipped dinosaurs that started out as small, bipedal running grazers, and grew in size and numbers until they became one of the most successful groups of herbivores in the Cretaceous world, and dominated the North American landscape. Their major evolutionary advantage was the progressive development of a chewing apparatus that became the most sophisticated ever developed by a reptile, rivaling that of modern mammals like the domestic cow. They reached their apex in the duck-bills, before they were wiped out by the Cretaceous-Tertiary extinction event along with all other non-avian dinosaurs. Members are known from all seven continents, although the Antarctic remains are unnamed, and they are generally rare in the Southern Hemisphere.

Ornithopod heads.

Ornithopoda (Template:PronEng) means "bird feet", from the Greek ornis ("bird") and pous ("feet"); this refers to their characteristic three-toed feet, although many early forms retained four toes. They were also characterized by having no armor, the development of a horny beak, an elongated pubis that eventually extended past the ilium, and a missing hole in the lower jaw.

The early ornithopods were only about 1 meter (3 feet) long, but probably very fast. They had a stiff tail, like the theropods, to help them balance as they ran on their hind legs. Later ornithopods became more adapted to grazing on all fours; their spines curved, and came to resemble the spines of modern ground-feeders like the bison. As they became more adapted to eating while bent over, they became semi-quadrupedal; still running on two legs, and comfortable reaching up into trees; but spending most of their time walking or grazing while on all fours. The taxonomy of dinosaurs previously ascribed to the hypsilophodontidae is problematic. The group previously consisted of all non-Iguanodontid bipedal ornithischians, but a phylogenetic reappraisal has shown such species to be paraphyletic. As such, the hypsolophodont family is represented only by Hypsilophodon[1].

Later ornithopods became larger, but never rivaled the incredible size of the long-necked, long-tailed sauropods that they partially supplanted; the largest, like the Edmontosaurus and Shantungosaurus, never exceeded 15 meters (50 feet).

Historically, most indeterminate ornithischian bipeds were lumped in as ornithopods. Most have since been reclassified as basal members of quadrupedal taxa like Marginocephalia; and some, like the "bone-headed" pachycephalosaurids, have been given their own taxa.

Classification

Taxonomy

Infraorder Ornithopoda

Phylogeny

Cladogram after Sues & Norman (1990) and Weishampel & Heinrich (1992). 

Ornithopoda
|-?Siluosaurus
|-?Changchunsaurus
`--Euornithopoda
   |--Hypsilophodontia
   `--Iguanodontia
      |--Tenontosaurus
      `--+--Rhabdodontidae
         |-?Muttaburrasaurus
         `--Euiguanodontia
            |--Anabisetia
            |--Gasparinisaura
            `--Dryomorpha
               |--Dryosauridae
               `--Ankylopollexia
                  |-?Bihariosaurus
                  |-?Talenkauen
                  |--Camptosauridae
                  `--Iguanodontoidea
                     |--Lurdusaurus
                     |--Lanzhousaurus
                     `--Hadrosauriformes
                        |--Iguanodon
                        `--+--Ouranosaurus
                           `--+--Fukuisaurus
                              `--Hadrosauroidea

References

  1. ^ Weishampel, D.B., and Heinrich, R.E. (1992). "Systematics of Hypsilophodontidae and basal Iguanodontia (Dinosauria: Ornithopoda)". Historical Biology. 6: 159–184.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Quelle: https://en.wikipedia.org/wiki/Special%3ADiff%2F206129863