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Borogovia
''Borogovia'' is a troodontid theropod dinosaur genus which lived during the Late Cretaceous Period, in what is now Mongolia. It contains one species, ''Borogovia gracilicrus.'' Discovery and naming In 1971, a Polish-Mongolian expedition discovered the remains of a small theropod at the Altan Uul IV site, in the Nemegt Basin of Ömnögovĭ province. In 1982, upon describing '' Hulsanpes perlei'', the find was reported by Halszka Osmólska and considered by her to be a possible specimen of '' Saurornithoides''.Osmólska, H., (1982), "''Hulsanpes perlei'' n.g.n.sp. (Deinonychosauria, Saurisichia, Dinosauria) from the Upper Cretaceous Barun Goyot Formation of Mongolia", ''Neues Jahrbuch für Geologie und Paläontologie, Monatshefte'' 1982(7): 440-448 Later she concluded that it represented a species new to science. In 1987, Osmólska named and described the type species ''Borogovia gracilicrus''. The generic name is derived from the fantasy creatures known as 'borogoves' i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Troodontid
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] |
Nemegt Formation
The Nemegt Formation (also known as Nemegtskaya Svita) is a geological formation in the Gobi Desert of Mongolia, dating to the Late Cretaceous. The formation consists of river channel sediments and contains fossils of fish, turtles, crocodilians, and a diverse fauna of dinosaurs, including birds. Description The Nemegt Formation is composed of mudstones and sandstones that were deposited by ancient lakes, streams, and flood plains. The Altan Uul locality was described by Michael Novacek as "a canyon carved out of a very rich series of sedimentary rocks" with "steep cliffs and narrow washes". The climate associated with it was wetter than when preceding formations were deposited; there seems to have existed at least some degree of forest cover as indicated by petrified fossil trunks. When examined, the rock facies of the upper section consist of braided meanders, and oxbow lakes. Alteration of sediment grades indicates frequent hydrodynamic condition changes (seasonal rain). Si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halszka Osmólska
Halszka Osmólska (September 15, 1930 – March 31, 2008) was a Polish paleontologist who had specialized in Mongolian dinosaurs. Early life, family and education Osmólska was born in 1930 in Poznań. In 1949, she began to study biology at Faculty of Biology and Earth Sciences of the University of Poznań. Thereafter, she studied at the University of Warsaw, graduating in 1955. Career Osmólska worked at the Institute of Paleobiology of the Polish Academy of Sciences (PAN). Between 1983 and 1988, she served as the institute's director. She was a member of the Polish–Mongolian expeditions to the Gobi Desert (1963–1965, 1967–1971), and she described many finds from these rocks, often with Teresa Maryańska. Among the dinosaurs she described: * '' Deinocheirus'' (1967), with Ewa Roniewicz * '' Gallimimus'' (1972), with Roniewicz and Rinchen Barsbold * '' Pachycephalosauria'' (1974), with Maryańska * ''Bagaceratops'' (1975), with Maryańska * '' Barsboldia'' (1981) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the more recent of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period. Climate During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident. The tropics became restricted to equatorial regions and northern latitudes experienced markedly more seasonal climatic conditions. Geography Due to plate tectonics, the Americas were gradually moving westward, causing the Atlantic Ocean to expand. The Western Interior Seaway divided North America into eastern and western halves; Appalachia and Laramidia. India maintained a northward course towards Asia. In the Southern Hemisphere, Aus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jianianhualong
''Jianianhualong'' (meaning "Jianianhua dragon") is a genus of troodontidae, troodontid theropoda, theropod dinosaur from the Early Cretaceous of China. It contains a single species, ''Jianianhualong tengi'', named in 2017 by Xu Xing (paleontologist), Xu Xing and colleagues based on an articulated skeleton preserving feathers. The feathers at the middle of the tail of ''Jianianhualong'' are asymmetric, being the first record of asymmetrical feathers among the troodontids. Despite aerodynamics, aerodynamic differences from the flight feathers of modern birds, the feathers in the tail vane of ''Jianianhualong'' could have functioned in aerodynamic drag, drag reduction whilst the animal was moving. The discovery of ''Jianianhualong'' supports the notion that asymmetrical feathers appeared early in the evolutionary history of the Paraves. ''Jianianhualong'' possesses a combination of traits seen in basal (phylogenetics), basal as well as traits seen in derived troodontids. This is con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sister Group
In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and taxon B are sister groups to each other. Taxa A and B, together with any other extant or extinct descendants of their most recent common ancestor (MRCA), form a monophyletic group, the clade AB. Clade AB and taxon C are also sister groups. Taxa A, B, and C, together with all other descendants of their MRCA form the clade ABC. The whole clade ABC is itself a subtree of a larger tree which offers yet more sister group relationships, both among the leaves and among larger, more deeply rooted clades. The tree structure shown connects through its root to the rest of the universal tree of life. In cladistic standards, taxa A, B, and C may represent specimens, species, genera, or any other taxonomic units. If A and B are at the same taxono ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tamarro
''Tamarro'' (named after a mythological creature in local culture) is a genus of troodontid theropod from the Late Cretaceous Talarn Formation (Tremp Group) of Spain. The genus contains a single species, ''Tamarro insperatus'', known from a partial metatarsal described in 2021. Discovery and naming The holotype of ''Tamarro'', MCD-7073, a metatarsal, was found in 2003 at the Sant Romà d'Abella site, belonging to the Talarn Formation of the Tremp Group. In 2021, Sellés ''et al.'' described it as a new genus and species, ''Tamarro insperatus''; the generic name is that of a small creature in the folklore of Pallars, Spain, while the specific name means "unexpected", referring to the unexpected discovery of the fossil. Classification Sellés ''et al.'' placed ''Tamarro'' in the Jinfengopteryginae, making it the first member of the subfamily from Europe. They also suggested that its ancestors migrated from Asia to Europe sometime between the Cenomanian and the Maastrichtian. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synonym (taxonomy)
In taxonomy, the scientific classification of living organisms, a synonym is an alternative scientific name for the accepted scientific name of a taxon. The Botanical nomenclature, botanical and Zoological nomenclature, zoological codes of nomenclature treat the concept of synonymy differently. * In nomenclature, botanical nomenclature, a synonym is a Binomial nomenclature, scientific name that applies to a taxon that now goes by a different scientific name. For example, Carl Linnaeus, Linnaeus was the first to give a scientific name (under the currently used system of scientific nomenclature) to the Norway spruce, which he called ''Pinus abies''. This name is no longer in use, so it is now a synonym of the current scientific name, ''Picea abies''. * In zoology, moving a species from one genus to another results in a different Binomial nomenclature, binomen, but the name is considered an alternative combination rather than a synonym. The concept of synonymy in zoology is reserved f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andrea Cau
Andrea Cau is an Italian vertebrate paleontologist. He specialises in the study of dinosaur cladistics. Cau named the unique dromaeosaurid theropod '' Halszkaraptor'' in 2017. He also reanalysed the theropod ''Balaur'', placing it as a basal avialan (primitive bird) rather than a dromaeosaur. Below is a list of taxa In biology, a taxon (back-formation from ''taxonomy''; : taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and ... that Cau has contributed to naming: Personal life Cau graduated in 2017 with a PhD in Life, Earth and Environmental Sciences. References {{DEFAULTSORT:Cau, Andrea Italian paleontologists Year of birth missing (living people) Living people Place of birth missing (living people) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
