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Dunkleosteus
''Dunkleosteus'' is an extinct genus of large arthrodira, arthrodire ("jointed-neck") fish that existed during the Late Devonian period, about 382–358 million years ago. It was a pelagic fish inhabiting open waters, and one of the first vertebrate apex predators of any ecosystem. ''Dunkleosteus'' consists of ten species, some of which are among the largest placoderms ("plate-skinned") to have ever lived: ''D. terrelli'', ''D. belgicus'', ''D. denisoni'', ''D. marsaisi'', ''D. magnificus'', ''D. missouriensis'', ''D. newberryi'', ''D. amblyodoratus'', ''D. raveri'', and ''D. tuderensis.'' However, the validity of several of these species is unclear. The largest and best known species is ''D. terrelli''. Since body shape is not known, various methods of estimation put the living total length of the largest known specimen of ''D. terrelli'' between long and its weight around . Lengths of or more are poorly supported, with the most recent and extensive studies on the body shape a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Placoderm
Placoderms (from Ancient Greek πλάξ [''plax'', ''plakos''] 'Plate (animal anatomy), plate' and δέρμα [''derma''] 'skin') are vertebrate animals of the class (biology), class Placodermi, an extinct group of prehistoric fish known from Paleozoic fossils during the Silurian and the Devonian geological period, periods. While their endoskeletons are mainly cartilaginous, their head and thorax were covered by articulated armour (zoology), armoured plates (hence the name), and the rest of the body was scale (zoology), scaled or naked depending on the species. Placoderms were among the first jawed fish (their fish jaw, jaws likely Evolution, evolved from the first pair of gill arches), as well as the first vertebrates to have true tooth, teeth. They were also the first fish clade to develop pelvic fins, the second set of paired fins and the homology (biology), homologous precursor to hindlimbs in tetrapods. 380-million-year-old fossils of three other genera, ''Incisoscutum'', ''M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dinichthys
''Dinichthys'' (from , 'terrible' and 'fish') is an extinct monospecific genus of large marine arthrodire placoderm from the Late Devonian (Famennian stage) measuring around long. Fossils were recovered from the Ohio Shale Formation along the Olentangy River in Delaware County, Ohio. Classification History ''Dinichthys'' was originally described in 1868 by John Newberry on the basis of an incomplete skull roof and mandibles (holotype AMNH 81). Subsequently, many unrelated large arthrodires were originally classified together within this genus, including species now assigned to ''Dunkleosteus'', ''Eastmanosteus'', and '' Titanichthys''. Notably, the type species of ''Dunkleosteus'' was originally described as ''Dinichthys terrelli'' by Newberry in 1873, and was later separated into ''Dunkleosteus'' by Jean-Pierre Lehman in 1956. ''Dunkleosteus'' was still thought to be closely related to ''Dinichthys'', and they were grouped together in the family Dinichthyidae. Howev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cleveland Shale
The Cleveland Shale, also referred to as the Cleveland Member of the Ohio Shale, is a Late Devonian (Famennian) shale Member (geology), geologic member in the eastern United States. Identification and name The Cleveland Shale was identified in 1870 and named for the city of Cleveland, Ohio. John Strong Newberry, director of the Ohio State Geological Survey, first identified the member in 1870. He called it the "Cleveland Shale" and designated its Type locality (geology), type locality at Doan Brook near Cleveland. Details of the type locality and of stratigraphic nomenclature for this unit as used by the U.S. Geological Survey are available on-line at the National Geologic Map Database. Description The primary minerals in the Cleveland Shale are chlorite, illite, pyrite, and quartz. Underground, the Cleveland Shale is black, dull grayish-black, bluish-black, or brownish-black in color. In exposed outcrops, it weathers to red, reddish-brown, or medium brown. Highly weathered r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthrodira
Arthrodira (Greek for "jointed neck") is an order of extinct armored, jawed fishes of the class Placodermi that flourished in the Devonian period before their sudden extinction, surviving for about 50 million years and penetrating most marine ecological niches. Arthrodires were the largest and most diverse of all groups of placoderms. Description Arthrodire placoderms are notable for the movable joint between armor surrounding their heads and bodies. Like all placoderms, they lacked distinct teeth; instead, they used the sharpened edges of a bony plate on their jawbone as a biting surface. The eye sockets are covered by a bony ring, which supports the eye, a feature shared by birds and some ichthyosaurs. Early arthrodires, such as the genus '' Arctolepis'', were well-armoured fishes with flattened bodies. The largest member of this group, ''Dunkleosteus'', was a true superpredator of the latest Devonian period, reaching as much as 6 m in length. In contrast, the long-nosed '' Ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Devonian
The Devonian ( ) is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at million years ago ( Ma), to the beginning of the succeeding Carboniferous period at Ma. It is the fourth period of both the Paleozoic and the Phanerozoic. It is named after Devon, South West England, where rocks from this period were first studied. The first significant evolutionary radiation of life on land occurred during the Devonian, as free- sporing land plants (pteridophytes) began to spread across dry land, forming extensive coal forests which covered the continents. By the middle of the Devonian, several groups of vascular plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants ( pteridospermatophytes) appeared. This rapid evolution and colonization process, which had begun during the Silurian, is known as the Silurian-Devonian Terrestrial Rev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cleveland Museum Of Natural History
The Cleveland Museum of Natural History is a natural history museum in University Circle, a district of educational, cultural and medical institutions approximately five miles (8 km) east of Downtown Cleveland, Ohio, United States. The museum was established in 1920 by Cyrus S. Eaton to perform research, education and development of collections in the fields of anthropology, archaeology, astronomy, botany, geology, paleontology, wildlife biology, and zoology. The museum traces its roots to the Ark, formed in 1836 on Cleveland's Public Square by William Case, the Academy of Natural Science formed by William Case and Jared Potter Kirtland, and the Kirtland Society of Natural History, founded in 1869 and reinvigorated in 1922 by the trustees of the Cleveland Museum of Natural History. Donald Johanson was the Museum's Curator of Physical Anthropology when he discovered "Lucy," the skeletal remains of the ancient hominid ''Australopithecus afarensis''. The current curato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean-Pierre Lehman
Jean-Pierre Lehman (10 August 1914 – 26 February 1981) was a French paleontologist who specialized on tetrapods and actinopterygians. He followed early ideas comparative anatomy to study evolution through cladistic ideas and making use of biogeographical affinities. Lehman was born in Caen to Madeleine Auvray and civil engineer Gaston Lehman. Educated at Lycée Carnot, and the Sorbonne he also went to Grenoble where he met and married Ingegärd Eneström, daughter of Swedish physician Erik Hjalmar Eneström. Visits to Sweden brought him into contact with Erik Stensiö at the Museum of Natural History of Stockholm where he worked on the vertebrates of the Upper Devonian of Scania in 1936–37. His thesis on the scales of thelodonts and acanthodians was criticized and led to a restudy of the material by J.M.J. Vergoossen. He worked as a high school teacher in Nice from 1940 to 1945 and made visits to Stockholm between 1945 and 1949. In 1950 he moved to the geology laborato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yale Peabody Museum
The Peabody Museum of Natural History at Yale University (also known as the Yale Peabody Museum of Natural History or the Yale Peabody Museum) is one of the oldest, largest, and most prolific university natural history museums in the world. It was founded by the philanthropist George Peabody in 1866 at the behest of his nephew Othniel Charles Marsh, an early paleontologist. The museum is best known for the Great Hall of Dinosaurs, which includes a mounted juvenile ''Brontosaurus'' and the mural '' The Age of Reptiles''. The museum also has permanent exhibits dedicated to human and mammal evolution; wildlife dioramas; Egyptian artifacts; local birds and minerals; and Native Americans of Connecticut. In 2020, the Peabody Museum closed for its "first comprehensive renovation in 90 years." It reopened, with more than twice the exhibition space, on March 26, 2024. Description The Peabody Museum is located at 170 Whitney Avenue in New Haven, Connecticut and is staffed by nearly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smithsonian National Museum Of Natural History
The National Museum of Natural History (NMNH) is a natural history museum administered by the Smithsonian Institution, located on the National Mall in Washington, D.C., United States. It has free admission and is open 364 days a year. With 4.4 million visitors in 2023, it was the third most-visited museum in the United States. Opened in 1910, the museum on the National Mall was one of the first Smithsonian buildings constructed exclusively to hold the national collections and research facilities. The main building has an overall area of with of exhibition and public space and houses over 1,000 employees. The museum's collections contain over 146 million specimens of plants, animals, fossils, minerals, rocks, meteorites, human remains, and human cultural artifacts, the largest natural history collection in the world. It is also home to about 185 professional natural history scientists—the largest group of scientists dedicated to the study of natural and cul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Museum Of Natural History
The American Museum of Natural History (AMNH) is a natural history museum on the Upper West Side of Manhattan in New York City. Located in Theodore Roosevelt Park, across the street from Central Park, the museum complex comprises 21 interconnected buildings housing 45 permanent exhibition halls, in addition to a planetarium and a library. The museum collections contain about 32 million specimens of plants, animals, fungi, fossils, minerals, rocks, meteorites, human remains, and human cultural artifacts, as well as specialized collections for frozen tissue and genomic and astrophysical data, of which only a small fraction can be displayed at any given time. The museum occupies more than . AMNH has a full-time scientific staff of 225, sponsors over 120 special field expeditions each year, and averages about five million visits annually. The AMNH is a private 501(c)(3) organization. The naturalist Albert S. Bickmore devised the idea for the American Museum of Natural History in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sheffield Lake, Ohio
Sheffield Lake is a city in Lorain County, Ohio, United States. The population was 8,957 at the 2020 census. It is part of the Cleveland metropolitan area. History Sheffield Lake was incorporated in 1920. The southern part split off as Sheffield Village in the 1930s. Geography According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 9,137 people, 3,721 households, and 2,481 families living in the city. The population density was . There were 4,093 housing units at an average density of . The racial makeup of the city was 94.5% White, 1.7% African American, 0.3% Native American, 0.5% Asian, 0.9% from other races, and 2.2% from two or more races. Hispanic or Latino of any race were 4.9% of the population. There were 3,721 households, of which 30.3% had children under the age of 18 living with them, 49.7% were married couples living together, 11.4% had a female householder with no hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elyria, Ohio
Elyria ( ) is a city in Lorain County, Ohio, United States, and its county seat. It is located at the forks of the Black River (Ohio), Black River in Northeast Ohio, southwest of Cleveland. The population was 52,656 at the 2020 United States census, 2020 census.2020 United States Census, Elyria Total population https://www.census.gov/search-results.html?searchType=web&cssp=SERP&q=Elyria%20city,%20Ohio It is a principal city in the Cleveland metropolitan area. Elyria is home to Lorain County Community College. Etymology The city's name is derived from the surname of its founder, Heman Ely, and Illyria, the historical name used by ancient Ancient Greece, Greeks and Roman Empire, Romans to refer to the western Balkans. History The village of Elyria was founded in 1817 by Heman Ely, who built a log house, dam, gristmill, and sawmill on the village's site along the Black River (Ohio), Black River. Ely began to build more houses to accommodate European-American settlers migrating to w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
