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Mitsukurinidae
Mitsukurinidae is a family of sharks with one living genus, '' Mitsukurina'', and four fossil genera: ''Anomotodon'', '' Protoscapanorhynchus'', ''Scapanorhynchus'', and '' Woellsteinia'', though some taxonomists consider ''Scapanorhynchus'' to be a synonym of ''Mitsukurina''. The only known living species is the goblin shark, ''Mitsukurina owstoni''. This family of sharks is named in honour of Kakichi Mitsukuri who brought the holotype of the only species in this family to David Starr Jordon to be scientifically described. The most distinctive characteristic of the goblin sharks is the long, trowel A trowel is a small hand tool used for digging, applying, smoothing, or moving small amounts of viscous or particulate material. Common varieties include the masonry trowel, garden trowel, and float trowel. A power trowel is a much larger gas ...-shaped, beak-like snout, much longer than those of other sharks. Its long snout is covered with ampullae of Lorenzini that enable i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goblin Shark
The goblin shark (''Mitsukurina owstoni'') is a rare species of deep-sea shark. Sometimes called a "living fossil", it is the only extant representative of the family Mitsukurinidae, a lineage some 125 million years old. This pink-skinned animal has a distinctive profile with an elongated, flat snout, and highly protrusible jaws containing prominent nail-like teeth. It is usually between long when mature, though it can grow considerably larger such as one captured in 2000 that is thought to have measured . Goblin sharks are benthopelagic creatures that inhabit upper continental slopes, submarine canyons, and seamounts throughout the world at depths greater than , with adults found deeper than juveniles. Some researchers believe that these sharks could also dive to depths of up to , for short periods of time. Various anatomical features of the goblin shark, such as its flabby body and small fins, suggest that it is sluggish in nature. This species hunts for teleost fishes, cepha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mitsukurinidae
Mitsukurinidae is a family of sharks with one living genus, '' Mitsukurina'', and four fossil genera: ''Anomotodon'', '' Protoscapanorhynchus'', ''Scapanorhynchus'', and '' Woellsteinia'', though some taxonomists consider ''Scapanorhynchus'' to be a synonym of ''Mitsukurina''. The only known living species is the goblin shark, ''Mitsukurina owstoni''. This family of sharks is named in honour of Kakichi Mitsukuri who brought the holotype of the only species in this family to David Starr Jordon to be scientifically described. The most distinctive characteristic of the goblin sharks is the long, trowel A trowel is a small hand tool used for digging, applying, smoothing, or moving small amounts of viscous or particulate material. Common varieties include the masonry trowel, garden trowel, and float trowel. A power trowel is a much larger gas ...-shaped, beak-like snout, much longer than those of other sharks. Its long snout is covered with ampullae of Lorenzini that enable i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scapanorhynchus
''Scapanorhynchus'' (from el, σκάφιου , 'shovel' and el, ῥύγχος 'snout') is an extinct genus of shark that lived from the early Cretaceous until possibly the Miocene if ''S. subulatus'' is a mitsukurinid and not a sand shark.Capetta, H., Chondrichthyes II, Mesozoic and Cenozoic Elasmobranchii, vol. 3B of Handbook of Paleoichthyology, Stuttgart, New York: Gustav Fischer Verlag, 1987.Glickman, L. S., and A. O. Averianov. "Evolution of the Cretaceous Lamnoid sharks of the genus Eostriatolamia." PALEONTOLOGICAL JOURNAL C/C OF PALEONTOLOGICHESKII ZHURNAL 32 (1998): 376-384/ref> Their extreme similarities to the living goblin shark, ''Mitsukurina owstoni'', lead some experts to consider reclassifying it as ''Scapanorhynchus owstoni''. However, most shark specialists regard the goblin shark to be distinct enough from its prehistoric relatives to merit placement in its own genus. ''Scapanorhynchus'' had an elongated, albeit flattened snout and sharp awl-shaped teeth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anomotodon
''Anomotodon'' is an extinct genus of shark related to the extant goblin shark (''Mitsukurina owstoni''). The distribution of ''Anomotodon'' fossils is worldwide, in formations indicating that members of the genus lived from the Early Cretaceous epoch through the Eocene epoch, and perhaps through the Oligocene as well. Described species include ''A. novus'', ''A. plicatus'', ''A. principalis'', and ''A. multidenticula''. See also *''Scapanorhynchus ''Scapanorhynchus'' (from el, σκάφιου , 'shovel' and el, ῥύγχος 'snout') is an extinct genus of shark that lived from the early Cretaceous until possibly the Miocene if ''S. subulatus'' is a mitsukurinid and not a sand shark.Capet ...'' References Further reading * * * Mitsukurinidae Cretaceous sharks Paleocene sharks Eocene sharks Prehistoric fish of Asia Shark genera Taxa named by Camille Arambourg Fossil taxa described in 1952 Prehistoric cartilaginous fish genera {{Cretaceous-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mitsukurina
''Mitsukurina'' is a genus of mackerel shark in the family Mitsukurinidae. It contains one extant species, the goblin shark (''M. owstoni'') and more extinct species. The genus was described by American ichthyologist David Starr Jordan in 1898 and named in honour of Kakichi Mitsukuri was a Japanese people, Japanese Zoology, zoologist. Biography Kakichi Mitsukuri was born in Edo. In 1873 he came to the United States, where he received a Doctor of Philosophy, Ph.D. degree from Yale University, Yale in 1879 and from Johns Hop .... Species * †'' Mitsukurina lineata'' (Probst, 1879) * †'' Mitsukurina maslinensis'' (Pledge, 1967) * '' Mitsukurina owstoni'' Jordan, 1898 (goblin shark) References Bartonian first appearances Extant Eocene first appearances Shark genera Taxa named by David Starr Jordan Fish genera with one living species {{shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now- extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shark Families
Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used to refer to all extinct members of Chondrichthyes with a shark-like morphology, such as hybodonts and xenacanths. The oldest modern sharks are known from the Early Jurassic. They range in size from the small dwarf lanternshark (''Etmopterus perryi''), a deep sea species that is only in length, to the whale shark (''Rhincodon typus''), the largest fish in the world, which reaches approximately in length. Sharks are found in all seas and are common to depths up to . They generally do not live in freshwater, although there are a few known exceptions, such as the bull shark and the river shark, which can be found in both seawater and fres ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxa Named By David Starr Jordan
In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and given a particular ranking, especially if and when it is accepted or becomes established. It is very common, however, for taxonomists to remain at odds over what belongs to a taxon and the criteria used for inclusion. If a taxon is given a formal scientific name, its use is then governed by one of the nomenclature codes specifying which scientific name is correct for a particular grouping. Initial attempts at classifying and ordering organisms (plants and animals) were set forth in Carl Linnaeus's system in '' Systema Naturae'', 10th edition (1758), as well as an unpublished work by Bernard and Antoine Laurent de Jussieu. The idea of a unit-based system of biological classification was first made widely available in 1805 in the i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grey Nurse Shark
The sand tiger shark (''Carcharias taurus''), gray nurse shark, spotted ragged-tooth shark or blue-nurse sand tiger, is a species of shark that inhabits subtropical and temperate waters worldwide. It inhabits the continental shelf, from sandy shorelines (hence the name sand tiger shark) and submerged reefs to a depth of around . They dwell in the waters of Japan, Australia, South Africa, and the east coasts of North and South America. The sand tiger shark also inhabited the Mediterranean, however it was last seen there in 2003 and is presumed extinct in the region. Despite its common names, it is not closely related to either the tiger shark (''Galeocerdo cuvier'') or the nurse shark (''Ginglymostoma cirratum''). Despite its fearsome appearance and strong swimming ability, it is a relatively placid and slow-moving shark with no confirmed human fatalities. This species has a sharp, pointy head, and a bulky body. The sand tiger's length can reach but is normally 2.2–2.5 m in leng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trowel
A trowel is a small hand tool used for digging, applying, smoothing, or moving small amounts of viscous or particulate material. Common varieties include the masonry trowel, garden trowel, and float trowel. A power trowel is a much larger gasoline or electrically powered walk-behind device with rotating paddles used to finish concrete floors. Hand tool Numerous forms of trowel are used in masonry, concrete, and drywall construction, as well as applying adhesives such as those used in tiling and laying synthetic flooring. Masonry trowels are traditionally made of forged carbon steel, but some newer versions are made of cast stainless steel, which has longer wear and is rust-free. These include: *Bricklayer's trowel has an elongated triangular-shaped flat metal blade, used by masons for leveling, spreading, and shaping cement, plaster, and mortar. *Pointing trowel, a scaled-down version of a bricklayer's trowel, for small jobs and repair work. *Tuck pointing trowel is lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kakichi Mitsukuri
was a Japanese people, Japanese Zoology, zoologist. Biography Kakichi Mitsukuri was born in Edo. In 1873 he came to the United States, where he received a Doctor of Philosophy, Ph.D. degree from Yale University, Yale in 1879 and from Johns Hopkins University, Johns Hopkins in 1883. He was appointed professor in the college of science of the Imperial University of Tokyo, Imperial University of Tokyo in 1882 and councilor of the university in 1893. In 1896, he was made head of the fur-seal commission and signed, on behalf of Japan, a treaty with the United States and Great Britain. In 1897, invited by the Lowell Institute in Boston, he gave lectures on "Social life in Japan" , translated into French in 1922 as "La vie sociale au Japon". In 1901 he became dean (education), dean of the college of science of Tokyo University, and in 1907 he was decorated with the Order of the Sacred Temple in recognition of public service. In later life his time was largely occupied with administra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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