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Beringraja
''Beringraja'' is a genus of skates in the family Rajidae with up to six described species. Formerly, they were included in the genus '' Raja'' until 2012, when the genus ''Beringraja'' was erected for the two species which had multiple embryos per egg capsule. Genetic evidence has led to four additional species being proposed for inclusion in the genus, although this issue has not be completely resolved.Last, P. R., S. Weigmann and L. Yang 2016. Changes to the nomenclature of the skates (Chondrichthyes: Rajiformes). In: Last and Yearsley (eds.). Rays of the World: Supplementary Information. CSIRO Special Publication. 11-34. These large skates are found in the North Pacific. Species Up to six species are in the genus: * Big skate (''B. binoculata'') * Cortez' ray (''B. cortezensis'') * California ray (''B. inornata'') * Longnose skate (''B. rhina'') * Mottled skate (''B. pulchra'') * Starry skate ''Raja stellulata'', commonly known as the Pacific starry skate, roc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Big Skate
The big skate (''Beringraja binoculata'') is the largest species of skate (family Rajidae) in the waters off North America. They are found along the Pacific Coast from Alaska to Baja California, typically from the intertidal zone to a depth of , and feed on benthic invertebrates and small fishes. They are unusual among skates in that their egg cases may contain up to seven eggs each. This species is one of the most commercially important skates off California and is sold for food. Taxonomy This species was described by Charles Frédéric Girard in 1855; its specific epithet ''binoculata'' is derived from the Latin ''bi'' meaning "two", and ''oculatus'' meaning "eyed", referring to the two prominent eyespots on its wings. Girard also described what would later be determined to be a junior synonym of ''B. binoculata'', ''R. cooperi'', based on notes made by James G. Cooper on a decaying big skate found ashore near the entrance of Shoalwater Bay, Washington. In some older literatur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beringraja Rhina
''Beringraja rhina'', commonly known as the longnose skate, is a species of skate in the family Rajidae from the northeast Pacific. It is found from the eastern Bering Sea and Alaska to Baja California and the Gulf of California. The longnose skate is found at depths of and often deeper than the big skate. The longnose skate has only recently been associated with the genus ''Beringraja'', having been previously included in ''Raja'' until genetic evidence supported reclassification.Last, P. R., S. Weigmann and L. Yang 2016. Changes to the nomenclature of the skates (Chondrichthyes: Rajiformes). In: Last and Yearsley (eds.). Rays of the World: Supplementary Information. CSIRO Special Publication. 11-34. This issue has not be completely resolved and the scientific name "''Raja rhina''" is still in widespread use. Description The longnose skate has an elongated snout and deeply notched pelvic fins. Maximum size has been reported as in length. Maximum age has been estimated as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mottled Skate
The mottled skate (''Beringraja pulchra'') is a species of skate in the family Rajidae. An inhabitant of shallow coastal waters, it is found in the northwestern Pacific Ocean off Korea, Japan, and China. This species grows to long and has a diamond-shaped pectoral fin disc with a long snout. It is characterized by a covering of prickles above and below its snout, but not elsewhere on its body, and a dark ring in the middle of each "wing" (though this may be indistinct in adults). The diet of the mottled skate consists of shrimp, cephalopods, bony fishes, and crabs. It is oviparous, with females producing egg capsules almost year-round. With the similar big skate (''B. binoculata''), it is one of only two skate species that regularly places multiple embryos (up to five) into a single egg case. The mottled skate is valued for food in South Korea and Japan. It is subject to heavy fishing, both intentional and bycatch, throughout its range, and its population has declined su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Starry Skate
''Raja stellulata'', commonly known as the Pacific starry skate, rock skate, prickly skate, or starry skate, is a species of cartilaginous fish in the family Rajidae. It is found on rocky bottoms at 18–982 m depths (typically 70–150 m) in the Northeast and Eastern Central Pacific, from Coronado Bank in northern Baja California in Mexico to Barkley Sound , image = Fishing boat in the Broken Group Islands.jpg , image_size = 260px , alt = , caption = Barkley Sound , image_bathymetry = , alt_bathymetry = , caption_bathymetry = , locat ... in British Columbia, Canada. Females reach a maximum total length of 76.1 cm and a maximum age of 15 years, while males can be up to 71.7 cm long and live up to 14 years; the total length at birth is 15.5–22.5 cm. This skate prefers cold water with a temperature of 4.1–11.6°C (average 8.9°C). Description ''R. stellulata'' skates have a row of strong spin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skate (fish)
Skates are cartilaginous fish belonging to the family Rajidae in the superorder Batoidea of rays. More than 150 species have been described, in 17 genera.LAST, P.R. & SÉRET, B. & STEHMANN, M.F.W. & WEIGMANN, S. (2016) Skates, Family Rajidae. In: Last, P.R., White, W.T., Carvalho, M.R. de, Séret, B., Stehmann, M.F.W & Naylor, G.J.P (Eds.) Rays of the World. CSIRO Publishing, Melbourne: 204–363 Softnose skates and pygmy skates were previously treated as subfamilies of Rajidae (Arhynchobatinae and Gurgesiellinae), but are now considered as distinct families. Alternatively, the name "skate" is used to refer to the entire order of Rajiformes (families Anacanthobatidae, Arhynchobatidae, Gurgesiellidae and Rajidae). Members of Rajidae are distinguished by a stiff snout and a rostrum that is not reduced. Taxonomy and systematics Evolution Skates belong to the ancient lineage of cartilaginous fishes. Fossil denticles (tooth-like scales in the skin) resembling those of today's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raja (fish)
''Raja'', also known as ''raia'', is a genus of Skate (fish), skates in the family (biology), family Rajidae containing 16 species. Formerly a wastebasket genus, many species historically placed here have been moved to other genera in the family, such as ''Amblyraja'', ''Beringraja'', ''Dipturus'', ''Leucoraja'' and ''Rostroraja''. ''Raja'' are flat-bodied, cartilaginous fish with a rhombic shapes due to their large pectoral fins extending from or nearly from the snouts to the bases of their tails. Their sharp snouts are produced by a cranial projection of rostral cartilage. The mouth and gills are located on underside of the body. They may be either solid-coloured or patterned, and most skates have spiny or thorn-like structures on the upper surface, and some species contain weak electrical organs within their tails. Mating typically occurs in the spring and the female lays numerous Egg (biology), eggs per clutch which are encapsulated in leathery cases, commonly known as "Egg cas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genetics
Genetics is the study of genes, genetic variation, and heredity in organisms.Hartl D, Jones E (2005) It is an important branch in biology because heredity is vital to organisms' evolution. Gregor Mendel, a Moravian Augustinian friar working in the 19th century in Brno, was the first to study genetics scientifically. Mendel studied "trait inheritance", patterns in the way traits are handed down from parents to offspring over time. He observed that organisms (pea plants) inherit traits by way of discrete "units of inheritance". This term, still used today, is a somewhat ambiguous definition of what is referred to as a gene. Trait inheritance and molecular inheritance mechanisms of genes are still primary principles of genetics in the 21st century, but modern genetics has expanded to study the function and behavior of genes. Gene structure and function, variation, and distribution are studied within the context of the cell, the organism (e.g. dominance), and within the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John D
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died c. AD 30), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (lived c. AD 30), one of the twelve apostles of Jesus * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pope Jo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tsutomu Miyaki
Tsutomu is a masculine Japanese given name. Possible writings ''Tsutomu can be written using different kanji characters. Here are some examples: *勉, "make effort" *務, "affairs" *務武, "affairs, warrior" *勤, "diligence" *努, "strive" The name can also be written in hiragana つとむ or katakana ツトム. Notable people with the name *,Japanese manga artist *, Japanese general in the Imperial Japanese Army *, Japanese tenor *, former Japanese shihan *, Japanese football player *, Japanese politician *, Japanese Greco-Roman wrestler *, Japanese film director *, Japanese wrestler *, Japanese ice hockey player *, Japanese politician and Prime Minister of Japan *, Japanese rugby union player *, Japanese professional golfer *, Japanese head coach of the Sun Rockers Shibuya *, Japanese actor and voice actor *, Japanese former manager *, Japanese former Nippon Professional Baseball pitcher *, Japanese voice actor *, Japanese ice hockey player, coach and administrator * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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