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orodromeus wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 discovery and naming 2 description 3 phylogeny 4 palaeobiology 5 references toggle the table of contents orodromeus 22 languages català čeština deutsch esperanto español français עברית hrvatski magyar bahasa indonesia italiano 日本語 nederlands polski português русский srpskohrvatski српскохрватски slovenčina svenska tiếng việt volapük 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikispecies wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia extinct genus of dinosaurs orodromeus temporal range late cretaceous 76 9 75 ma preꞓ ꞓ o s d c p t j k pg n orodromeus makelai scientific classification kingdom animalia phylum chordata class reptilia clade dinosauria clade ornithischia family thescelosauridae subfamily orodrominae genus orodromeus horner weishampel 1988 species o makelai binomial name orodromeus makelai horner weishampel 1988 reconstruction of the orodromeus skeleton orodromeus meaning mountain runner is a genus of herbivorous orodromine thescelosaurid dinosaur from the late cretaceous of north america only one species is known the type species orodromeus makelai discovery and naming edit size of known individuals of orodromeus left compared to its relatives thescelosaurus right and parksosaurus center as well as a human the remains of orodromeus were discovered by robert makela during the excavation in teton county montana of the egg mountain brooding colony of a much larger relative maiasaura the type species orodromeus makelai was named and shortly described by jack horner and david b weishampel in 1988 the generic name is derived from greek ὄρος oros mountain in reference to the egg mountain site and δρομεύς dromeus runner referring to the cursorial habits of the animal the specific name honoured the late makela 1 who had died in a car accident in 1987 shortly after he discovered the first remains of the animal 2 the holotype specimen mor 294 was found in a layer of the two medicine formation dating from the campanian stage about 75 million years ago it consists of a partial skeleton with skull the paratypes are mor 246 a clutch of nineteen eggs some with embryos pp 22412 a set of hindlimbs mor 331 a partial skeleton mor 248 a skeleton with skull and mor 403 a braincase 1 a full published description is still lacking though an unpublished thesis on orodromeus exists 3 however mor 246 and other eggs from egg mountain are now considered to belong to a troodontid 4 which may be stenonychosaurus 5 description edit orodromeus was a small fast bipedal herbivore that probably coexisted with dinosaurs such as daspletosaurus and einiosaurus its length was estimated by horner weishampel at 2 5 metres 1 skull and partial vertebral column of orodromeus mor 294 orodromeus is distinguished by a palpebral that is at its back attached to the postorbital a boss on the jugal a non fused wrist and triangular maxillary and dentary teeth with a superficial flat occlusion 1 phylogeny edit reconstructed pelvis of orodromeus model nest and hatchlings of orodromeus makelai orodromeus was by horner weishampel assigned to the hypsilophodontidae as the youngest known member 1 today these are seen as an unnatural paraphyletic group and orodromeus is simply considered to be a basal member of the euornithopoda brown et al 2013 6 put it in the family thescelosauridae and named a new subfamily orodrominae after it palaeobiology edit because of the advanced development of the bones and teeth of the embryos horner concluded that the young of orodromeus were precocial it has been speculated that this animal may have burrowed much like its relative oryctodromeus based upon the packing of their bones in situations where they typically would have been scattered 7 mallon et al 2013 examined herbivore coexistence on the island continent of laramidia during the late cretaceous it was concluded that small ornithischians like orodromeus were generally restricted to feeding on vegetation at or below the height of 1 meter 8 references edit 1 2 3 4 5 horner j and weishampel d 1988 a comparative embryological study of two ornithischian dinosaurs nature london 332 no 6161 256 257 1988 chester montana liberty county times archived obituaries 1987 robert raymond makela scheetz r d 1999 osteology of orodromeus makelai and the phylogeny of basal ornithopod dinosaurs d ph thesis in biology montana state university bozeman 189 pp varricchio d j jackson f borkowski j j horner j r 1997 nest and egg clutches of the dinosaur troodon formosus and the evolution of avian reproductive traits nature 385 6613 247 250 bibcode 1997natur 385 247v doi 10 1038 385247a0 s2cid 4313286 van der reest a j currie p j 2017 troodontids theropoda from the dinosaur park formation alberta with a description of a unique new taxon implications for deinonychosaur diversity in north america canadian journal of earth sciences 54 9 919 935 bibcode 2017cajes 54 919v doi 10 1139 cjes 2017 0031 hdl 1807 78296 brown et al 2013 new data on the diversity and abundance of small bodied ornithopods dinosauria ornithischia from the belly river group campanian of alberta journal of vertebrate paleontology 33 3 495 520 bibcode 2013jvpal 33 495b doi 10 1080 02724634 2013 746229 s2cid 129160518 varricchio david j martin anthony j katsura yoshihiro 2007 first trace and body fossil evidence of a burrowing denning dinosaur proceedings of the royal society b biological sciences 274 1616 1361 1368 doi 10 1098 rspb 2006 0443 pmc 2176205 pmid 17374596 mallon jordan c david c evans michael j ryan jason s anderson 2013 feeding height stratification among the herbivorous dinosaurs from the dinosaur park formation upper campanian of alberta canada bmc ecology 13 1 14 bibcode 2013bmce 13 14m doi 10 1186 1472 6785 13 14 pmc 3637170 pmid 23557203 v t e ornithischia kingdom animalia phylum chordata class sauropsida clade avemetatarsalia clade dinosauria avemetatarsalia see avemetatarsalia ornithischia see below ornithischia ornithischia archaeocursor chilesaurus eocursor laquintasaura lesothosaurus pisanosaurus silesauridae heterodontosauridae abrictosaurus echinodon fruitadens heterodontosaurus lycorhinus manidens pegomastax tianyulong thyreophora emausaurus jakapil scelidosaurus scutellosaurus yuxisaurus parankylosauria ankylosauria see ankylosauria stegosauria see stegosauria neornithischia agilisaurus enigmacursor hexinlusaurus hypsilophodon kulindadromeus minimocursor nanosaurus phyllodon pulaosaurus sanxiasaurus xiaosaurus yandusaurus thescelosauridae albertadromeus changchunsaurus changmiania doolysaurus fona haya jeholosaurus koreanosaurus nanosaurus nevadadromeus orodromeus oryctodromeus parksosaurus thescelosaurus yueosaurus zephyrosaurus ornithopoda see ornithopoda marginocephalia ceratopsia see ceratopsia pachycephalosauria see pachycephalosauria see also nomina dubia alocodon bienosaurus craspedodon fabrosaurus ferganocephale geranosaurus gongbusaurus laosaurus notoceratops siluosaurus syngonosaurus tatisaurus tichosteus trimucrodon incertae sedis ajkaceratops chilesaurus dravidosaurus jakapil serendipaceratops other taxa ornithoscelida phytodinosauria silesauridae hypsilophodontidae jeholosauridae other articles list of stratigraphic units with ornithischian tracks taxon identifiers orodromeus wikidata q134226 wikispecies orodromeus eol 47459862 gbif old 4823171 irmng 1018706 open tree of life 4947368 paleobiology database 64337 portals dinosaurs canada retrieved from https en wikipedia org w index php title orodromeus oldid 1365127483 categories thescelosauridae dinosaur genera campanian dinosaurs two medicine formation taxa named by jack horner taxa named by david b weishampel fossil taxa described in 1988 dinosaurs of the united states hidden categories articles with short description short description is different from wikidata articles with species microformats this page was last edited on 20 july 2026 at 12 11 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of 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