|
Beorn (tardigrade)
''Beorn leggi'' is an extinct species of tardigrades, and the known first fossil tardigrade, discovered and described in 1964 from Late Cretaceous amber from Manitoba, Canada. It is the only species in the genus ''Beorn'', and family Beornidae. It is one of two fossil tardigrades known from the Cretaceous, the other being '' Milnesium swolenskyi'' from the Turonian New Jersey amber In addition to some other finds from the Cretaceous and the Cambrian period, Beorn is one of the few references to the existence of tardigrades in the history of the earth, and its largely modern appearance shows that tardigrades must have diversified considerably before this time. The species was first described in 1964 by Kenneth W. Cooper, the typological specimen is now in the Museum of Comparative Zoology at Harvard University. The generic name ''Beorn'' was chosen by Cooper in reference to a figure of the same name from the children's book The Hobbit by J. R. R. Tolkien, which can occur both i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Campanian
The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian spans the time from 83.6 (± 0.2) to 72.1 (± 0.2) million years ago. It is preceded by the Santonian and it is followed by the Maastrichtian. The Campanian was an age when a worldwide sea level rise covered many coastal areas. The morphology of some of these areas has been preserved: it is an unconformity beneath a cover of marine sedimentary rocks. Etymology The Campanian was introduced in scientific literature by Henri Coquand in 1857. It is named after the French village of Champagne in the department of Charente-Maritime. The original type locality was a series of outcrop near the village of Aubeterre-sur-Dronne in the same region. Definition The base of the Campanian Stage is defined as a place in the stratigraphic column wher ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Princeton University
Princeton University is a private university, private research university in Princeton, New Jersey. Founded in 1746 in Elizabeth, New Jersey, Elizabeth as the College of New Jersey, Princeton is the List of Colonial Colleges, fourth-oldest institution of higher education in the United States and one of the nine colonial colleges chartered before the American Revolution. It is one of the highest-ranked universities in the world. The institution moved to Newark, New Jersey, Newark in 1747, and then to the current site nine years later. It officially became a university in 1896 and was subsequently renamed Princeton University. It is a member of the Ivy League. The university is governed by the Trustees of Princeton University and has an endowment of $37.7 billion, the largest List of colleges and universities in the United States by endowment, endowment per student in the United States. Princeton provides undergraduate education, undergraduate and graduate education, graduate in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Campanian Genera
The Campanian is the fifth of six age (geology), ages of the Late Cretaceous epoch (geology), Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stage (stratigraphy), stages in the Upper Cretaceous series (stratigraphy), Series. Campanian spans the time from 83.6 (± 0.2) to 72.1 (± 0.2) million years ago. It is preceded by the Santonian and it is followed by the Maastrichtian. The Campanian was an age when a worldwide marine transgression, sea level rise covered many coastal areas. The geomorphology, morphology of some of these areas has been preserved: it is an unconformity beneath a cover of marine sedimentary rocks. Etymology The Campanian was introduced in scientific literature by Henri Coquand in 1857. It is named after the French village of Champagne, Charente-Maritime, Champagne in the department of Charente-Maritime. The original type locality (geology), type locality was a series of out ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil Taxa Described In 1964
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic Protostome Genera
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. In contrast, an oligotypic taxon contains more than one but only a very few subordinate taxa. Examples Just as the term ''monotypic'' is used to describe a taxon including only one subdivision, the contained taxon can also be referred to as monotypic within the higher-level taxon, e.g. a genus monotypic within a family. Some examples of monotypic groups are: Plants * In the order Amborellales, there is only one family, Amborellaceae and there is only one genus, ''Amborella'', and in this genus there is only one species, namely ''Amborella trichopoda.'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tardigrade Genera
Tardigrades (), known colloquially as water bears or moss piglets, are a phylum of eight-legged segmented micro-animals. They were first described by the German zoologist Johann August Ephraim Goeze in 1773, who called them Kleiner Wasserbär ("little water bear"). In 1777, the Italian biologist Lazzaro Spallanzani named them Tardigrada (), which means "slow steppers". They have been found in diverse regions of Earth's biospheremountaintops, the deep sea, tropical rainforests, and the Antarctic. Tardigrades are among the most resilient animals known, with individual species able to survive extreme conditions – such as exposure to extreme temperatures, extreme pressures (both high and low), air deprivation, radiation, dehydration, and starvation – that would quickly kill most other known forms of life. Tardigrades have survived exposure to outer space. There are about 1,300 known species in the phylum Tardigrada, a part of the superphylum Ecdysozoa consisting of animals tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parachaela
Parachela is an order of tardigrades in the class Eutardigrada. Members of this order have existed for at least 72 million years, including the present. The oldest known species is '' Beorn leggi''. Superfamilies and families The order includes the following superfamilies and families: * Eohypsiboiidea ** Eohypsibiidae * Hypsibioidea ** Calohypsibiidae ** Hypsibiidae ** Microhypsibiidae ** Ramazzottiidae * Isohypsibioidea ** Hexapodibiidae ** Isohypsibiidae * Macrobiotoidea ** Beornidae ** Macrobiotidae ** Murrayidae ** Necopinatidae ** Richtersiidae Richtersiidae is a family of tardigrade Tardigrades (), known colloquially as water bears or moss piglets, are a phylum of eight-legged segmented micro-animals. They were first described by the German zoologist Johann August Ephraim Goeze in ... References External links * * Protostome orders Polyextremophiles {{Tardigrade-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterotardigrada
The class Heterotardigrada includes tardigrades (water bears) that have cephalic appendages and legs with four separate but similar digits or claws on each. 444 species have been described. Anatomy The anatomy of the reproductive system is an important defining feature in distinguishing the different groups of tardigrades. Heterotardigrades have gonoducts that open to the outside through a preanal gonopore, rather than opening into the rectum as in the only other confirmed class of tardigrades, the Eutardigrada. The third class, Mesotardigrada Mesotardigrada is one of three classes of tardigrades, consisting of a single species, ''Thermozodium esakii''. The animal reportedly has six claws of equal length at each foot. This species was described in 1937 by German zoologist Gilbert Rah ..., is represented by a single species known from a single specimen that is now lost, and the location from which that specimen was collected has since been destroyed by an earthquake, so its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypsibiidae
The Hypsibiidae are a family of water bears or moss piglets, tardigrades in the class Eutardigrada. Subfamilies and genera * Subfamily Diphasconinae ** '' Diphascon'' ** '' Hebesuncus'' ** '' Paradiphascon'' * Subfamily Hypsibiinae ** '' Acutuncus'' ** ''Doryphoribius'' ** '' Eremobiotus'' ** ''Halobiotus'' ** ''Hypsibius'' ** ''Isohypsibius'' ** '' Mixibius'' ** '' Pseudobiotus'' ** '' Ramajendas'' ** ''Ramazzottius ''Ramazzottius'' is a genus of water bear or moss piglet, a tardigrade in the class Eutardigrada Eutardigrada are a class of tardigrades (Tardigrada) without lateral appendices. Primarily freshwater bound, some species have secondarily gained ...'' ** '' Thulinius'' * Subfamily Itaquasconinae ** '' Astatumen'' ** '' Itaquascon'' ** '' Mesocrista'' ** '' Parascon'' ** '' Platicrista'' References External links Tardigrade families Polyextremophiles {{Tardigrade-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saskatchewan River
The Saskatchewan River (Cree: ''kisiskāciwani-sīpiy'', "swift flowing river") is a major river in Canada. It stretches about from where it is formed by the joining together of the North Saskatchewan and South Saskatchewan Rivers to Lake Winnipeg. It flows roughly eastward across Saskatchewan and Manitoba to empty into Lake Winnipeg. Through its tributaries the North Saskatchewan and South Saskatchewan, its watershed encompasses much of the prairie regions of Canada, stretching westward to the Rocky Mountains in Alberta and north-western Montana in the United States. Including its tributaries, it reaches to its farthest headwaters on the Bow River, a tributary of the South Saskatchewan in Alberta. Description It is formed in central Saskatchewan, approximately east of Prince Albert, by the confluence of its two major branches, the North Saskatchewan and the South Saskatchewan, at the Saskatchewan River Forks. Both source rivers originate from glaciers in the Alberta Ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cedar Lake (Manitoba)
Cedar Lake is a lake just north of Lake Winnipegosis in Manitoba, Canada. Cedar Lake's water level is controlled by the Grand Rapids dam. The town of Grand Rapids and the First Nations town of Easterville are nearby. The lake is known to have excellent examples of prehistoric amber fossil of cretaceous age. This type of amber is called as "Chemawinit", according to an Indian tribe which lives in this area. Another name of this amber is "Cedarit". This amber contains many organic inclusions. To date, these inclusions have not been thoroughly researched. The lake's main source is the Saskatchewan River, which forms a delta on the northwest side of the lake. The flow of the Saskatchewan River to Lake Winnipeg on the eastern end of Cedar Lake is regulated by the Grand Rapids dam built in 1962 by Manitoba Hydro. See also *Saskatchewan River Delta *List of lakes of Manitoba This is an incomplete list of lakes of Manitoba, a province of Canada. Larger lake statistics The total are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abdomen
The abdomen (colloquially called the belly, tummy, midriff, tucky or stomach) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. The abdomen is the front part of the abdominal segment of the torso. The area occupied by the abdomen is called the abdominal cavity. In arthropods it is the posterior (anatomy), posterior tagma (biology), tagma of the body; it follows the thorax or cephalothorax. In humans, the abdomen stretches from the thorax at the thoracic diaphragm to the pelvis at the pelvic brim. The pelvic brim stretches from the lumbosacral joint (the intervertebral disc between Lumbar vertebrae, L5 and Vertebra#Sacrum, S1) to the pubic symphysis and is the edge of the pelvic inlet. The space above this inlet and under the thoracic diaphragm is termed the abdominal cavity. The boundary of the abdominal cavity is the abdominal wall in the front and the peritoneal surface at the rear. In vertebrates, the abdomen is a large body c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Saskatchewan River")
