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Fadenia
''Fadenia'' is an extinct genus of eugeneodontid holocephalian chondrichthyan from the Carboniferous Period of Missouri (United States), the Permian period of Greenland, and the Early Triassic epoch of Greenland and Sulphur Mountain Formation of British Columbia, Canada. Eugeneodontida are an extinct order of Chondrichthyes. They are characterized by the presence of tooth whorls. They include iconic genera, such as ''Helicoprion'' (buzz-saw shark), '' Ornithoprion'', '' Edestus'' or '' Caseodus''. ''Fadenia'' is one of the few eugeneodontid genera that survived the end-Permian mass extinction event. It is one of the last surviving genera of this clade. It could reach about in length. The first fossils of Fadenia were discovered and written about in the periodical Meddelelser om Grønland in 1932 by the Danish vertebrate palaeontologist Eigil Nielsen after studying the Upper Permian beds of Cape Stosch, in the fjord of Godthab Gulf in King Christian X Land, Greenland. He had ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gunnar Seidenfaden
Gunnar Seidenfaden (1908 – February 9, 2001) was a Danish diplomat and botanist. He was Danish ambassador in Thailand 1955–1959, and in the U.S.S.R. 1959–1961. He was an expert on Southeast Asia Orchidaceae. He published several multi-volume works on orchids, e.g. ''The Orchids of Thailand – A Preliminary List'' (with T. Smitinand) and ''Orchid Genera in Thailand'' vol. I- XIV. These works are strictly taxonomic and floristic, but decorated with Seidenfaden's own drawings of flower parts as seen under the dissection microscope. His collection of more than 10,000 specimens was donated to the University of Copenhagen, together with original drawings by Katja Anker and others. In June 2016, it was decided that the collection of orchid samples, which was held in the Danish capital botanical garden Botanisk Have, part of the natural history museum Statens Naturhistoriske Museum, would be returned to Thailand. The reason given was that many of the specimens have become quite rare ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caseodus
''Caseodus'' is an extinct genus of eugeneodontid holocephalian from the Carboniferous of the United States (Illinois, Indiana, Kansas, South Dakota) and the Early Triassic of Canada (British Columbia). It was of medium size, measuring in length. Eugeneodontida are an extinct order of Chondrichthyes. They are characterized by the presence of tooth whorls. They include iconic genera, such as ''Helicoprion'' ("buzz-saw shark"), ''Ornithoprion'', '' Edestus'' or '' Fadenia''. ''Caseodus'' is one of the few eugeneodontid genera that survived the end-Permian mass extinction event. It is one of the last surviving genera of this clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, .... ''Caseodus'' is named after the late paleoichthyologist Gerard Case. References * Caseodo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicoprion
''Helicoprion'' is an extinct genus of shark-like eugeneodont fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls", which in life were embedded in the lower jaw. As with most extinct cartilaginous fish, the skeleton is mostly unknown. Fossils of ''Helicoprion'' are known from a 20 million year timespan during the Permian period from the Artinskian stage of the Cisuralian (Early Permian) to the Roadian stage of the Guadalupian (Middle Permian). The closest living relatives of ''Helicoprion'' (and other eugeneodonts) are the chimaeras, though their relationship is very distant. The unusual tooth arrangement is thought to have been an adaption for feeding on soft bodied prey, and may have functioned as a deshelling mechanism for hard bodied cephalopods such as nautiloids and ammonoids. In 2013, systematic revision of ''Helicoprion'' via morphometric analysis of the tooth whorls found only ''H. davisii, H. bessonowi'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edestus
''Edestus'' is an extinct genus of edestoid cartilaginous fish known from the Late Carboniferous ( Pennsylvanian) of the United Kingdom, Russia, and the United States. Most remains consist of isolated curved blades or "whorls" that are studded with teeth, that in life were situated within the jaws. ''Edestus'' is a Greek name derived from the word ''edeste'' (to devour), in reference to the aberrant quality and size of the species' teeth. The largest species, ''E. heinrichi'', has been conservatively estimated to reach greater than 6.7 m (22 ft) in length, around the size of the largest known great white shark. Like its other relatives, such as ''Helicoprion'', and unlike modern sharks, the species of ''Edestus'' grew teeth in curved blades or "whorls". In ''Edestus''' case, only a single row of teeth occurred in the midline of each jaw, leading ''Edestus'' to sometimes be described as the "scissor tooth shark". The degree of curvature in the teeth brackets, along with s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Triassic
The Early Triassic is the first of three epochs of the Triassic Period of the geologic timescale. It spans the time between Ma and Ma (million years ago). Rocks from this epoch are collectively known as the Lower Triassic Series, which is a unit in chronostratigraphy. The Early Triassic is the oldest epoch of the Mesozoic Era. It is preceded by the Lopingian Epoch (late Permian, Paleozoic Era) and followed by the Middle Triassic Epoch. The Early Triassic is divided into the Induan and Olenekian ages. The Induan is subdivided into the Griesbachian and Dienerian subages and the Olenekian is subdivided into the Smithian and Spathian subages. The Lower Triassic series is coeval with the Scythian Stage, which is today not included in the official timescales but can be found in older literature. In Europe, most of the Lower Triassic is composed of Buntsandstein, a lithostratigraphic unit of continental red beds. The Early Triassic and partly also the Middle Triassic span the in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eugeneodontida
The Eugeneodontida is an extinct and poorly known order of cartilaginous fishes. They possessed "tooth-whorls" on the symphysis of either the lower or both jaws and pectoral fins supported by long radials. They probably lacked pelvic fins and anal fins. The palatoquadrate was either fused to the skull or reduced. Now determined to be within the Holocephali, their closest living relatives are ratfish. The eugeneodonts are named after paleontologist Eugene S. Richardson, Jr. The Eugeneodontida disappeared in the Early Triassic. Members of the Eugeneodontida are further classified into different families, the most well-preserved members that have been discovered are commonly placed within the families Helicoprionidae ("spiral saws"), and Edestidae ("those which devour"), the former containing the genera ''Helicoprion'', '' Sarcoprion'', and '' Parahelicoprion'', and the latter containing the genera '' Edestus'', ''Lestrodus'', and '' Metaxyacanthus''. All eugeneodonts are thought ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carboniferous
The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carboniferous'' means "coal-bearing", from the Latin '' carbō'' ("coal") and '' ferō'' ("bear, carry"), and refers to the many coal beds formed globally during that time. The first of the modern 'system' names, it was coined by geologists William Conybeare and William Phillips in 1822, based on a study of the British rock succession. The Carboniferous is often treated in North America as two geological periods, the earlier Mississippian and the later Pennsylvanian. Terrestrial animal life was well established by the Carboniferous Period. Tetrapods (four limbed vertebrates), which had originated from lobe-finned fish during the preceding Devonian, became pentadactylous in and diversified during the Carboniferous, including early amphibian line ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lauge Koch
Lauge Koch (5 July 1892 – 5 June 1964) was a Danish geologist and Arctic explorer. Biography Lauge Koch was born in 1892 to Karl and Elisabeth Koch. His development as a scientist was greatly influenced by his father's second cousin Johan Peter Koch - a polar explorer, a member of several Greenland expeditions, including Ludvig Mylius-Erichsen's and Alfred Wegener's (in the latter's expedition (1912-1913) to cross Greenland, he led a sledging party). He received his higher education at the University of Copenhagen, where he began his studies in 1911, in 1920 he received a master's degree, and in 1929 a doctor's degree, having defended a dissertation on the topic "Stratigraphy of Greenland". General He was the renowned leader of 24 Danish government expeditions to Greenland, and the central character in the ''Lauge Koch Controversy'', an international and intra-national conflict. Beginning in December 1935 a bitter conflict arose between Koch and eleven of the most prominent Da ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three-year Expedition To East Greenland
The Three-year Expedition ( da, Treårsekspeditionen) was an exploratory expedition to East Greenland that lasted from 1931 to 1934 financed by the Carlsberg Foundation and the Danish state. The expedition included aerial surveys. Many geographic features in East Greenland were mapped and named during the expedition. Eskimonaes station was used as a wintering base by the Three-year Expedition to East Greenland. History The expedition was led by Lauge Koch. The other participants were Danish and Swedish geographers, geologists, archaeologists, zoologists and botanists: Paul Gelting, Gunnar Seidenfaden, Thorvald Sørensen, Steen Hasselbach, Helge G. Backlund, Gunnar Thorson, Gunnar Säve-Söderbergh, Helge Larsen, Thyge Johansen, L. Bruhn, H. Heinrich Nielsen and N. V. Petersen. The expedition vessels were ''Godthaab'' and ''Gustav Holm''.Koch, Lauge (1933) The Danish Three-Year Expedition to King Christian X Land. Geographical Review 23 (4): 599-607Full text/ref> The engage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
King Christian X Land
King Christian X Land ( da, Kong Christian X Land) is an area of northeastern Greenland. History This area was named after King Christian X of Denmark and Iceland (1870 – 1947), who rose to the throne in 1912. At the time of the Three-year Expedition to East Greenland it is reported that when Lauge Koch was planning to fly over the region in 1932 he said: The name 'King Christian X Land' was first used on the 1932 1:1 million scale Danish Geodesic Institute map. At that time the area was occupied by Norway and was renamed 'Erik the Red's Land' ''(Eirik Raudes Land)'' but the Permanent Court of International Justice ruled against Norway in 1933 and the country subsequently abandoned its claims. Myggbukta was a Norwegian radio and weather station that operated in the coast intermittently during the 20th century. Geography King Christian X Land stretches above the Arctic Circle between the Scoresby Sound at 70°N and the Bessel Fjord at 76°N. It is bordered by King Christi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Godthab Gulf
Godthab Gulf ( da, Godthåb Golf), also known as Godthaab Golf, Clavering Fjord, Clavering Sound and Inner Bay, is a fjord in King Christian X Land, East Greenland. Administratively it is part of the Northeast Greenland National Park zone. History The bay was named "Godthaab Golf" during the 1929–1930 Expedition to East Greenland by Lauge Koch after expedition ship ''Godthaab'', a 287-ton barquentine built at Sandefjord (Norway) in 1898 and purchased by the Greenland Administration ''(Grønlands Styrelse)''. Geography Godthab Gulf lies southwest of Clavering Island and north of Cape Stosch A cape is a clothing accessory or a sleeveless outer garment which drapes the wearer's back, arms, and chest, and connects at the neck. History Capes were common in medieval Europe, especially when combined with a hood in the chaperon. The ... and the northern coastline of Hold with Hope. It is only wide at the entrance, but it widens to almost towards its head.''Prostar Sailing Dir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upper Permian
The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleozoic Era; the following Triassic Period belongs to the Mesozoic Era. The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the region of Perm in Russia. The Permian witnessed the diversification of the two groups of amniotes, the synapsids and the sauropsids (reptiles). The world at the time was dominated by the supercontinent Pangaea, which had formed due to the collision of Euramerica and Gondwana during the Carboniferous. Pangaea was surrounded by the superocean Panthalassa. The Carboniferous rainforest collapse left behind vast regions of desert within the continental interior. Amniotes, which could better cope with these drier conditions, rose to dominance in place of their amp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
