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Quaesitosaurus
''Quaesitosaurus'' (meaning "extraordinary lizard") is a genus of nemegtosaurid sauropod containing only the type species, ''Q. orientalis'', described in 1983. It lived from 72 to 71 million years ago during the Late Cretaceous epoch in the Barun Goyot Formation. With long, low and horse-like with frontally located peg-teeth, the skull of ''Quaesitosaurus'' is similar enough to the skull of ''Diplodocus'' and its kin to have prompted informed speculation that the missing body was built like those of diplodocids. Discovery and naming During the Combined Soviet-Mongolian Paleontological Expeditions in 1971, an isolated, incomplete sauropod skull and nearly complete mandible were unearthed at a fossil site in the Upper Cretaceous bluffs of the Barun Goyot Formation near Shar Tsav, Mongolia. The fossils were later transported to the Paleontological Institute of the Russian Academy of Sciences (then the USSR Academy of Sciences) where they were catalogued as PIN 3906/2. The specimen wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quaesitosaurus Size
''Quaesitosaurus'' (meaning "extraordinary lizard") is a genus of nemegtosaurid sauropod containing only the type species, ''Q. orientalis'', described in 1983. It lived from 72 to 71 million years ago during the Late Cretaceous epoch in the Barun Goyot Formation. With long, low and horse-like with frontally located peg-teeth, the skull of ''Quaesitosaurus'' is similar enough to the skull of ''Diplodocus'' and its kin to have prompted informed speculation that the missing body was built like those of diplodocids. Discovery and naming During the Combined Soviet-Mongolian Paleontological Expeditions in 1971, an isolated, incomplete sauropod skull and nearly complete mandible were unearthed at a fossil site in the Upper Cretaceous bluffs of the Barun Goyot Formation near Shar Tsav, Mongolia. The fossils were later transported to the Paleontological Institute of the Russian Academy of Sciences (then the USSR Academy of Sciences) where they were catalogued as PIN 3906/2. The specimen wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quaesitosaurus
''Quaesitosaurus'' (meaning "extraordinary lizard") is a genus of nemegtosaurid sauropod containing only the type species, ''Q. orientalis'', described in 1983. It lived from 72 to 71 million years ago during the Late Cretaceous epoch in the Barun Goyot Formation. With long, low and horse-like with frontally located peg-teeth, the skull of ''Quaesitosaurus'' is similar enough to the skull of ''Diplodocus'' and its kin to have prompted informed speculation that the missing body was built like those of diplodocids. Discovery and naming During the Combined Soviet-Mongolian Paleontological Expeditions in 1971, an isolated, incomplete sauropod skull and nearly complete mandible were unearthed at a fossil site in the Upper Cretaceous bluffs of the Barun Goyot Formation near Shar Tsav, Mongolia. The fossils were later transported to the Paleontological Institute of the Russian Academy of Sciences (then the USSR Academy of Sciences) where they were catalogued as PIN 3906/2. The specimen wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nemegtosaurid
Nemegtosauridae is a family of titanosaurian sauropod dinosaurs based on their diplodocid-like skulls. Only three species are known: ''Nemegtosaurus'', '' Quaesitosaurus'' and possibly ''Tapuiasaurus'', each from the Cretaceous. History of classification Due to the diplodocid-like nature of the taxa placed in Nemegtosauridae, the systematic position of this family in Sauropoda was disputed until recently. McIntosh (1990) included both these animals in the family Diplodocidae, subfamily Dicraeosaurinae, as they resemble the skull of ''Dicraeosaurus'', although differing in certain details. Although the skull of ''Nemegtosaurus'' was found in the same formation as the headless skeleton of ''Opisthocoelicaudia'', McIntosh (1990) kept ''Nemegtosaurus'' in Diplodocoidea while keeping ''Opisthocoelicaudia'' separate from the former, a position reiterated by Upchurch (1995, 1999), and Upchurch et al. (2004). A cladistic analysis published in 2002 transferred ''Nemegtosaurus'' and ''Opi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nemegtosauridae
Nemegtosauridae is a Scientific classification, family of titanosaurian sauropod dinosaurs based on their diplodocidae, diplodocid-like skulls. Only three species are known: ''Nemegtosaurus'', ''Quaesitosaurus'' and possibly ''Tapuiasaurus'', each from the Cretaceous. History of classification Due to the diplodocid-like nature of the taxa placed in Nemegtosauridae, the systematic position of this family in Sauropoda was disputed until recently. McIntosh (1990) included both these animals in the family Diplodocidae, subfamily Dicraeosauridae, Dicraeosaurinae, as they resemble the skull of ''Dicraeosaurus'', although differing in certain details. Although the skull of ''Nemegtosaurus'' was found in the same formation as the headless skeleton of ''Opisthocoelicaudia'', McIntosh (1990) kept ''Nemegtosaurus'' in Diplodocoidea while keeping ''Opisthocoelicaudia'' separate from the former, a position reiterated by Upchurch (1995, 1999), and Upchurch et al. (2004). A cladistics, cladisti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barun Goyot Formation
The Barun Goyot Formation (also known as Baruungoyot Formation or West Goyot Formation) is a geological formation dating to the Late Cretaceous Period. It is located within and is widely represented in the Gobi Desert Basin, in the Ömnögovi Province of Mongolia. Description It was previously known as the Lower Nemegt Beds occurring beneath the Nemegt Formation and above the Djadokhta Formation. It has been suggested that the Djadokhta and Barun Goyot Formations are lower and upper parts, respectively, of the same lithological unit and the boundary between the two does not exist. The stratotype of the Barun Goyot Formation is the Khulsan locality, east of Nemegt. At Nemegt, only the uppermost barungoyotian beds are visible. The ''Red Beds of Khermeen Tsav'' are also considered part of the Barun Goyot Formation. It is approximately in thickness,Gradzinski, R.; & Jerzykiewicz, T. (1974). Sedimentation of the Barun Goyot formation. Palaeontologica Polonica, 30, 111-146. and was l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Premaxilla
The premaxilla (or praemaxilla) is one of a pair of small cranial bones at the very tip of the upper jaw of many animals, usually, but not always, bearing teeth. In humans, they are fused with the maxilla. The "premaxilla" of therian mammal has been usually termed as the incisive bone. Other terms used for this structure include premaxillary bone or ''os premaxillare'', intermaxillary bone or ''os intermaxillare'', and Goethe's bone. Human anatomy In human anatomy, the premaxilla is referred to as the incisive bone (') and is the part of the maxilla which bears the incisor teeth, and encompasses the anterior nasal spine and alar region. In the nasal cavity, the premaxillary element projects higher than the maxillary element behind. The palatal portion of the premaxilla is a bony plate with a generally transverse orientation. The incisive foramen is bound anteriorly and laterally by the premaxilla and posteriorly by the palatine process of the maxilla. It is formed from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithostrotians
Lithostrotia is a clade of derived titanosaur sauropods that lived during the Early Cretaceous and Late Cretaceous. The group was defined by Upchurch ''et al.'' in 2004 as the most recent common ancestor of ''Malawisaurus'' and ''Saltasaurus'' and all the descendants of that ancestor. Lithostrotia is derived from the Ancient Greek , meaning "inlaid with stones", referring to the fact that many known lithostrotians are preserved with osteoderms. However, osteoderms are not a distinguishing feature of the group, as the two noted by Unchurch ''et al.'' include caudal vertebrae with strongly concave front faces (procoely), although the farthest vertebrae are not procoelous. History of research In 1895, Richard Lydekker named the family Titanosauridae to summarize sauropods with procoelous (concave on the front) caudal vertebrae. The name Titanosauridae has since been widely used, and was defined by Salgado and colleagues (1997), Gonzalaz-Riga (2003), and Salgado (2003) as a node-based ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous Dinosaurs Of Asia
Late may refer to: * LATE, an acronym which could stand for: ** Limbic-predominant age-related TDP-43 encephalopathy, a proposed form of dementia ** Local-authority trading enterprise, a New Zealand business law ** Local average treatment effect, a concept in econometrics Music * ''Late'' (album), a 2000 album by The 77s * Late!, a pseudonym used by Dave Grohl on his ''Pocketwatch'' album * Late (rapper), an underground rapper from Wolverhampton * "Late" (song), a song by Blue Angel * "Late", a song by Kanye West from ''Late Registration'' Other * Late (Tonga), an uninhabited volcanic island southwest of Vavau in the kingdom of Tonga * "Late" (''The Handmaid's Tale''), a television episode * LaTe, Oy Laivateollisuus Ab, a defunct shipbuilding company * Late may refer to a person who is Dead See also * * * ''Lates'', a genus of fish in the lates perch family * Later (other) * Tardiness * Tardiness (scheduling) In scheduling, tardiness is a measure of a delay in exe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dicraeosauridae
Dicraeosauridae is a family of diplodocoid sauropods who are the sister group to Diplodocidae. Dicraeosaurids are a part of the Flagellicaudata, along with Diplodocidae. Dicraeosauridae includes genera such as ''Amargasaurus'', ''Suuwassea'', ''Dicraeosaurus'', and ''Brachytrachelopan''. Specimens of this family have been found in North America, Asia, Africa, and South America. Their temporal range is from the Early or Middle Jurassic to the Early Cretaceous. Few dicraeosaurids survived into the Cretaceous, the youngest of which was ''Amargasaurus''. The group was first described by German paleontologist Werner Janensch in 1914 with the discovery of ''Dicraeosaurus'' in Tanzania. Dicraeosauridae are distinct from other sauropods because of their relatively short neck size and small body size. The clade is monophyletic and well-supported phylogenetically with thirteen unambiguous synapomorphies uniting it. They diverged from Diplodocidae in the Mid-Jurassic, as evidenced by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dicraeosaurus
''Dicraeosaurus'' (Gr. , ' "bifurcated, double-headed" + Gr. , ' "lizard") is a genus of diplodocoid sauropod dinosaur that lived in what is now Lindi Region, Tanzania during the late Jurassic period. The genus was named for the neural spines on the back of its neck. The first fossil was described by paleontologist Werner Janensch in 1914. Description Unlike most diplodocoids, ''Dicraeosaurus'' had a comparatively large head with a relatively short and wide neck. The neck contained 12 unusually short vertebrae, likely indicating a low-level browser of vegetation no more than off the ground. ''Dicraeosaurus'' also lacked the "whiplash" tail tip typical of diplodocoids. It was smaller than many other diplodocoids, at only in length and , though this still makes it among the larger known members of the family Dicraeosauridae. The genus is notable for the rather tall neural spines protruding from its vertebrae, which it is named for. They were not straight as in some members of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autapomorphy
In phylogenetics, an autapomorphy is a distinctive feature, known as a derived trait, that is unique to a given taxon. That is, it is found only in one taxon, but not found in any others or outgroup taxa, not even those most closely related to the focal taxon (which may be a species, family or in general any clade). It can therefore be considered an apomorphy in relation to a single taxon. The word ''autapomorphy'', first introduced in 1950 by German entomologist Willi Hennig, is derived from the Greek words αὐτός, ''autos'' "self"; ἀπό, ''apo'' "away from"; and μορφή, ''morphḗ'' = "shape". Discussion Because autapomorphies are only present in a single taxon, they do not convey information about relationship. Therefore, autapomorphies are not useful to infer phylogenetic relationships. However, autapomorphy, like synapomorphy and plesiomorphy is a relative concept depending on the taxon in question. An autapomorphy at a given level may well be a synapomorphy at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anatomical Terms Of Location
Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position provides a definition of what is at the front ("anterior"), behind ("posterior") and so on. As part of defining and describing terms, the body is described through the use of anatomical planes and anatomical axes. The meaning of terms that are used can change depending on whether an organism is bipedal or quadrupedal. Additionally, for some animals such as invertebrates, some terms may not have any meaning at all; for example, an animal that is radially symmetrical will have no anterior surface, but can still have a description that a part is close to the middle ("proximal") or further from the middle ("distal"). International organisations have determined vocabularies that are often used as standard vocabularies for subdisciplines of anatom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
