Ornithopods

Ornithopods - Ornithopods

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Ornithopods http://nykorea.net/dino/Dino-img/Recearch-Disign/CORYTHOSAURUS2.jpg http://www.plantapalm.com/vce/evolution/images/C5.JPG http://www.cartage.org.lb/en/themes/sciences/Paleontology/Paleozoology/Mesozoic/1iguanodon.jpg
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Relationships Ornithischians- the bird-hipped dinosaurs Genosaurs- the cheeked ornithischians Cerapodans- genosaurs with a diastema and 5 or fewer premaxillay teeth The sister group of the ornithopods within the cerapodans is the marginocephalians (remember that this is comprised of the pachycephalosaurs and the ceratopsians)
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Cladogram of relationships Fig. II.3
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General Information First evolved in the early Jurassic and persist until the end of the Cretaceous One of the most diverse groups of dinosaurs, with nearly 100 species currently known One of the oldest groups of dinosaurs
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General information continued Early forms were rather small (1-2 m), but later forms, such as hadrosaurs reached 10- 12 m long
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Small forms typically bipedal, but larger forms were bipedal to quadrupedal, as is evidenced from trackways Locomotion Large iguanodontian tracks ( Caririchnium ) from the Dakota Formation of Morrison CO. Note the manus/pes sets. oficina.cienciaviva.pt/~pw011/jazidas/tracks_. ..
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Trackways also suggest that juveniles of large forms were bipedal, and that a shift to quadrupedal locomotion occurred as the animal grew Locomotion Caririchnium from the Dakota Formation of Morrison CO. from Introduction to the study of Dinosaurs by Martin (2006)
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So how fast were they? Speeds calculated from large trackways
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This note was uploaded on 04/22/2008 for the course GEOL 111 taught by Professor Getty during the Fall '07 term at UConn.

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Ornithopods - Ornithopods

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