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Orodromeus
''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 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'' and ''Orodromeus niedae'', were 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.Horner, J. and Weishampel, D., 1988, "A comparative embryological study of two ornithischian dinosaurs", ''Nature'' (London), 332(No. 6161): 256-257 (1988) The holo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 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'' and ''Orodromeus niedae'', were 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.Horner, J. and Weishampel, D., 1988, "A comparative embryological study of two ornithischian dinosaurs", ''Nature'' (London), 332(No. 6161): 256-257 (1988) The holoty ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thescelosauridae
Thescelosauridae is a clade of neornithischians from the Cretaceous of East Asia and North America. The group was originally used as a name by Charles M. Sternberg in 1937, but was not formally defined until 2013, where it was used by Brown and colleagues as the group uniting ''Thescelosaurus'' and '' Orodromeus'', based on their phylogenetic results. During a phylogenetic revision of neornithischians by Clint Boyd in 2015, the authorship of Thescelosauridae was given to Brown and colleagues, which meant that the similar name Parksosauridae, informally defined in 2002 by Buchholz, would have had priority over Thescelosauridae. The two clades had slightly different definitions, with Parksosauridae referring to all animals closer to ''Parksosaurus'' than ''Hypsilophodon'', but they contained the same taxa so Boyd used Parksosauridae under the assumption it had priority. However, in formalizing the clade following the regulations of the PhyloCode, Madzia, Boyd, and colleagues identif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Two Medicine Formation
The Two Medicine Formation is a geological formation, or rock body, in northwestern Montana and southern Alberta that was deposited between 82.4 Ma and 74.4 Ma, during Campanian (Late Cretaceous) time. It crops out to the east of the Rocky Mountain Overthrust Belt, and the western portion (about thick) of this formation is folded and faulted while the eastern part, which thins out into the Sweetgrass Arch, is mostly undeformed plains. Below the formation are the nearshore (beach and tidal zone) deposits of the Virgelle Sandstone, and above it is the marine Bearpaw Shale. Throughout the Campanian, the Two Medicine Formation was deposited between the western shoreline of the Late Cretaceous Interior Seaway and the eastward advancing margin of the Cordilleran Overthrust Belt. The Two Medicine Formation is mostly sandstone, deposited by rivers and deltas. History of research In 1913 in paleontology, 1913, a US Geological Survey crew headed by Eugene Stebinger and a US National Museu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stenonychosaurus
''Stenonychosaurus'' (meaning "narrow claw lizard") is a disputed genus of troodontidae, troodontid dinosaur from the Late Cretaceous Dinosaur Park Formation of Alberta, Canada, as well as possibly the Two Medicine Formation. The type and only species, ''S. inequalis'', was named by Charles Mortram Sternberg in 1932, based on a foot, fragments of a hand, and some caudal vertebrae from the Late Cretaceous of Alberta. ''S. inequalis'' was reassigned in 1987 by Phil Currie to the genus ''Troodon'', which was reverted by the recognition of ''Stenonychosaurus'' as a separate genus from the possibly nomen dubium, dubious ''Troodon'' in 2017 by Evans ''et al.'' and also later in the same year by Van der Reest and Currie. History of discovery The first specimens currently assigned to ''Troodon'' that were not teeth were both found by Sternberg in 1928, in the Dinosaur Park Formation of Alberta. The first was named ''Stenonychosaurus inequalis'' by Sternberg in 1932, based on a foot, frag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1988 In Paleontology
Plants Angiosperms Arthropods Crustaceans Insects Archosauromorphs Newly named non-avian dinosaurs Data courtesy of George Olshevsky's dinosaur genera list. * The dubious family, Ornitholestidae is named by Gregory Scott Paul. Newly named birds Pterosaurs New taxa References {{portal, Paleontology [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maiasaura
''Maiasaura'' (from the Greek ''μαῖα'', meaning "midwife" and ''σαύρα'', the feminine form of ''saurus'', meaning "reptile") is a large herbivorous saurolophine hadrosaurid ("duck-billed") dinosaur genus that lived in the area currently covered by the state of Montana and the Canadian province of Alberta, in the Upper Cretaceous Period (mid to late Campanian), from 86.3 to 70.6 million years ago.Horner, J. R., Schmitt, J. G., Jackson, F., & Hanna, R. (2001). Bones and rocks of the Upper Cretaceous Two Medicine-Judith River clastic wedge complex, Montana. In Field trip guidebook, Society of Vertebrate Paleontology 61st Annual Meeting: Mesozoic and Cenozoic Paleontology in the Western Plains and Rocky Mountains. Museum of the Rockies Occasional Paper (Vol. 3, pp. 3-14). ''Maiasaura peeblesorum'' is the state fossil of Montana. The first remains of ''Maiasaura'' ''peeblesorum'' were discovered in the Two Medicine Formation near Chouteau, Montana in 1978 by Bynum, Montana r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jack Horner (paleontologist)
John Robert Horner (born June 15, 1946) is an American paleontologist most famous for describing '' Maiasaura'', providing the first clear evidence that some dinosaurs cared for their young. In addition to his paleontological discoveries, Horner served as the technical advisor for the first five ''Jurassic Park'' films, had a cameo appearance in '' Jurassic World'', and served as a partial inspiration for one of the lead characters of the franchise, Dr. Alan Grant. Horner studied at the University of Montana, although he did not complete his degree due to undiagnosed dyslexia, and was awarded a Doctorate in Science ''honoris causa''. He retired from Montana State University on July 1, 2016, although he claims to have been pushed out of the Museum of the Rockies after having married an undergraduate student and now teaches as a Presidential Fellow at Chapman University. Biography Horner was born and raised near Shelby, Montana. He was 8 years old when he found his first di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dinosaur
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic Geological period, period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the #Evolutionary history, evolution of dinosaurs is a subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 mya and their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record shows that birds are feathered dinosaurs, Evolution of birds, having evolved from earlier Theropoda, theropods during the Late Jurassic epoch, and are the only dinosaur lineage known to have survived the Cretaceous–Paleogene extinction event approximately 66 mya. Dinosaurs can therefore be divided into avian dinosaurs—birds—and the extinct non-avian dinosaurs, which are all dinosaurs other than birds. Dinosaurs are varied from taxonomy (biology), taxonomic, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Campanian
The Campanian is the fifth of six ages of the Late Cretaceous epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian spans the time from 83.6 (± 0.2) to 72.1 (± 0.2) million years ago. It is preceded by the Santonian and it is followed by the Maastrichtian. The Campanian was an age when a worldwide sea level rise covered many coastal areas. The morphology of some of these areas has been preserved: it is an unconformity beneath a cover of marine sedimentary rocks. Etymology The Campanian was introduced in scientific literature by Henri Coquand in 1857. It is named after the French village of Champagne in the department of Charente-Maritime. The original type locality was a series of outcrops near the village of Aubeterre-sur-Dronne in the same region. Definition The base of the Campanian Stage is defined as a place in the stratigraphic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Troodontidae
Troodontidae is a clade of bird-like theropod dinosaurs from the Late Jurassic to Late Cretaceous. During most of the 20th century, troodontid fossils were few and incomplete and they have therefore been allied, at various times, with many dinosaurian lineages. More recent fossil discoveries of complete and articulated specimens (including specimens which preserve feathers, eggs, embryos, and complete juveniles), have helped to increase understanding about this group. Anatomical studies, particularly studies of the most primitive troodontids, like '' Sinovenator'', demonstrate striking anatomical similarities with ''Archaeopteryx'' and primitive dromaeosaurids, and demonstrate that they are relatives comprising a clade called Paraves. Evolution The oldest definitive troodontid known is '' Hesperornithoides'' from the Late Jurassic of Wyoming. The slightly older '' Koparion'' of Utah is only represented by a single tooth, and small maniraptoran teeth from the Middle Jurassic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species Description
A species description is a formal scientific description of a newly encountered species, typically articulated through a scientific publication. Its purpose is to provide a clear description of a new species of organism and explain how it differs from species that have been previously described or related species. For a species to be considered valid, a species description must follow established guidelines and naming conventions dictated by relevant nomenclature codes. These include the International Code of Zoological Nomenclature (ICZN) for animals, the International Code of Nomenclature for algae, fungi, and plants (ICN) for plants, and the International Committee on Taxonomy of Viruses (ICTV) for viruses. A species description often includes photographs or other illustrations of type material and information regarding where this material is deposited. The publication in which the species is described gives the new species a formal scientific name. Some 1.9 million ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
