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Mark Norell
Mark Allen Norell (born July 26, 1957) is an American paleontologist, acknowledged as one of the most important living vertebrate paleontologists. He is currently the chairman of paleontology and a research associate at the American Museum of Natural History. He is best known as the discoverer of the first theropod embryo and for the description of feathered dinosaurs. Norell is credited with the naming of the genera ''Apsaravis'', ''Byronosaurus'', '' Citipati'', '' Tsaagan'', and '' Achillobator''. His work regularly appears in major scientific journals (including cover stories in Science and Nature) and was listed by Time magazine as one of the ten most significant science stories of 1993, 1994 and 1996. Norell is both a fellow of the Explorer's Club and the Willi Hennig Society. Career Norell's research has encompassed a number of different areas, from the theoretical study of diversity through time, his doctoral dissertation on alligator phylogeny, and his postdoctoral w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint Paul, Minnesota
Saint Paul (abbreviated St. Paul) is the capital of the U.S. state of Minnesota and the county seat of Ramsey County. Situated on high bluffs overlooking a bend in the Mississippi River, Saint Paul is a regional business hub and the center of Minnesota's government. The Minnesota State Capitol and the state government offices all sit on a hill close to the city's downtown district. One of the oldest cities in Minnesota, Saint Paul has several historic neighborhoods and landmarks, such as the Summit Avenue Neighborhood, the James J. Hill House, and the Cathedral of Saint Paul. Like the adjacent and larger city of Minneapolis, Saint Paul is known for its cold, snowy winters and humid summers. As of the 2021 census estimates, the city's population was 307,193, making it the 67th-largest city in the United States, the 12th-most populous in the Midwest, and the second-most populous in Minnesota. Most of the city lies east of the Mississippi River near its confluence with the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleontologist
Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossils to classify organisms and study their interactions with each other and their environments (their paleoecology). Paleontological observations have been documented as far back as the 5th century BC. The science became established in the 18th century as a result of Georges Cuvier's work on comparative anatomy, and developed rapidly in the 19th century. The term itself originates from Greek (, "old, ancient"), (, ( gen. ), "being, creature"), and (, "speech, thought, study"). Paleontology lies on the border between biology and geology, but differs from archaeology in that it excludes the study of anatomically modern humans. It now uses techniques drawn from a wide range of sciences, including biochemistry, mathematics, and engineerin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Placoderms
Placodermi (from Greek πλάξ 'plate' and δέρμα 'skin', literally 'plate-skinned') is a class of armoured prehistoric fish, known from fossils, which lived from the Silurian to the end of the Devonian period. Their head and thorax were covered by articulated armoured plates and the rest of the body was scaled or naked, depending on the species. Placoderms were among the first jawed fish; their jaws likely evolved from the first of their gill arches. Placoderms are thought to be paraphyletic, consisting of several distinct outgroups or sister taxa to all living jawed vertebrates, which originated among their ranks. In contrast, one 2016 analysis concluded that placodermi are likely monophyletic, though these analyses have been further dismissed with more transitional taxa between placoderms and modern gnathosthomes, solidifying their paraphyletic status. Placoderms were also the first fish to develop pelvic fins, the precursor to hindlimbs in tetrapods, as well ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylogenetic Tree
A phylogenetic tree (also phylogeny or evolutionary tree Felsenstein J. (2004). ''Inferring Phylogenies'' Sinauer Associates: Sunderland, MA.) is a branching diagram or a tree showing the evolutionary relationships among various biological species or other entities based upon similarities and differences in their physical or genetic characteristics. All life on Earth is part of a single phylogenetic tree, indicating common ancestry. In a ''rooted'' phylogenetic tree, each node with descendants represents the inferred most recent common ancestor of those descendants, and the edge lengths in some trees may be interpreted as time estimates. Each node is called a taxonomic unit. Internal nodes are generally called hypothetical taxonomic units, as they cannot be directly observed. Trees are useful in fields of biology such as bioinformatics, systematics, and phylogenetics. ''Unrooted'' trees illustrate only the relatedness of the leaf nodes and do not require the ancestral root to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halls Of Vertebrate Evolution
Halls is a plural of the word hall. Halls may also refer to: People * Walter Halls (1871–1953), British trade unionist and politician * Ethel May Halls (1882–1967), American actress * Julian Halls (born 1967), British field hockey player * Evelyn Halls (born 1972), Australian fencer * Roxana Halls (born 1974), English artist * Monty Halls (born 1976), British marine biologist and TV presenter * John Halls (born 1982), English footballer, mostly played for Stoke, Brentford and Aldershot, and model * Andy Halls (born 1992), English footballer, has played for Stockport, Macclesfield and Chester * Halls (footballer) (born 1999), Brazilian footballer * Henrique Halls (born 2002), Brazilian footballer Places * Halls, Georgia, an unincorporated community * Halls, Missouri, an unincorporated community * Halls, Tennessee, a town in West Tennessee ** Not to be confused with Halls Crossroads, Tennessee, a suburb of Knoxville sometimes colloquially referred to as "Halls" Bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Willi Hennig Society
The Willi Hennig Society "was founded in 1980 with the expressed purpose of promoting the field of phylogenetic systematics." The society is represented by phylogenetic systematists managing and publishing in the peer-reviewed journal titled ''Cladistics''. The society is named after Willi Hennig, a German systematic entomologist who developed the modern methods and philosophical approach to systematics in the 1940s and 1950s. The society is also involved in reconstructing the tree of life. The current president, Ward Wheeler of the American Museum of Natural History, was elected in 2016, succeeding Dr. Jyrki Muona. Founding The Willi Hennig Society was founded on a philosophical division among systematic biologists in the late 1970s. A debate created the rift between pheneticists who advocated for statistical or numerical methods that grouped taxa by overall similarity in taxonomy and systematic biologists who adopted a strict cladistic approach to taxonomy, recognizing groups by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Explorer's Club
The Explorers Club is an American-based international multidisciplinary professional society with the goal of promoting scientific exploration and field study. The club was founded in New York City in 1904, and has served as a meeting point for explorers and scientists worldwide. The Explorers Club hosts an annual dinner to honor accomplishments in exploration, which is known for its adventurous, exotic cuisine. History In 1904, a group of men active in exploration met at the request of noted journalist, historian, and explorer Henry Collins Walsh, to form an organization to unite explorers in the bonds of good fellowship and to promote the work of exploration by every means in its power. Joining Walsh were Adolphus Greely, Donaldson Smith, Carl Lumholtz, Marshall Saville, Frederick Dellenbaugh, and David Brainard. After several further informal meetings, The Explorers Club was incorporated on October 25, 1905. Women were first admitted in 1981, with a class including Sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achillobator
''Achillobator'' ( ; meaning "Achilles hero") is a genus of large dromaeosaurid dinosaurs that lived in Asia during the Late Cretaceous period about 96 million to 89 million years ago in what is now the Bayan Shireh Formation. The genus is currently monotypic, only including the type species ''A. giganticus''. The first remains were found in 1989 during a Mongolian-Russian field expedition in Mongolia and later described in 1999. Remains at the type locality of ''Achillobator'' may represent additional specimens. It represents the first and largest dromaeosaurid known from the Bayan Shireh Formation. It was a large, heavy-built, ground-dwelling, bipedal carnivore that would have been an active feathered predator hunting with the enlarged sickle claw on each second toe. Estimated at in length with a body mass about or more, ''Achillobator'' is considered to be one of the largest dromaeosaurs, along with ''Austroraptor'', ''Dakotaraptor'' and ''Utahraptor''. ''Achillobator'' was a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tsaagan
''Tsaagan'' (meaning "white") is a genus of dromaeosaurid dinosaur from the Djadokhta Formation of the Late Cretaceous of Mongolia. Discovery and naming The holotype of ''Tsaagan'' was discovered in 1996 and first identified as a specimen of ''Velociraptor''. After a CAT-scan in May 1998 it was concluded that it represented a new genus. In December 2006 its type species was named and described by Mark Norell, James Clark, Alan Turner, Peter Makovicky, Rinchen Barsbold and Timothy Rowe. The species name, ''Tsaagan mangas'', should be read as a whole with the generic name qualifying the specific epithet, and is derived from the Mongolian words for "white monster" (), although with an accidental misspelling of the word Tsagaan. The holotype specimen, IGM 100/1015, was found near Xanadu in Ömnögovi Province in layers of the Djadokhta Formation dating to the Campanian, about 75 million years ago. It consists of a well-preserved skull and series of ten neck vertebrae as well ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citipati
''Citipati'' (; meaning "funeral pyre lord") is a genus of oviraptorid dinosaur that lived in Asia during the Late Cretaceous period, about 75 million to 71 million years ago. It is mainly known from the Ukhaa Tolgod locality at the Djadokhta Formation, where the first remains were collected during the 1990s. The genus and type species ''Citipati osmolskae'' were named and described in 2001. A second species from the adjacent Zamyn Khondt locality may also exist. ''Citipati'' is one of the best-known oviraptorids thanks to a number of well-preserved specimens, including individuals found in brooding positions atop nests of eggs, though most of them were initially referred to the related ''Oviraptor''. These nesting specimens have helped to solidify the link between non-avian dinosaurs and birds. ''Citipati'' was among the largest oviraptorids; it is estimated to have been around in length and to have weighed . Its skull was highly pneumatized, short, and had a characteristic c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Byronosaurus
''Byronosaurus'' is a genus of troodontid dinosaur from the Late Cretaceous Period of Mongolia. Discovery and naming In 1993, Michael Novacek, a member of an American Museum of Natural History expedition to the Gobi Desert, discovered the skeleton of a small theropod at Ukhaa Tolgod. This was further excavated in 1994 and 1995. The find was illustrated in a publication in 1994. On 15 July 1996, at the Bolor's Hill site, about eight kilometers (five miles) away from the original location, a second specimen was discovered, a skull. In 2000, Mark Norell, Peter Makovicky and James Clark named and described the type species ''Byronosaurus jaffei''. The species name as a whole honoured Byron Jaffe, "in recognition of his family's support for the Mongolian Academy of Sciences-American Museum of Natural History Paleontological Expeditions". The holotype, IGM 100/983, was found in a layer of the Djadochta Formation dating from the late Campanian. It consists of a partial skeleton wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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