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Centroscyllium Excelsum
The highfin dogfish (''Centroscyllium excelsum'') is a sleeper shark of the family Etmopteridae, found in the northwest Pacific Ocean on the Emperor Seamount chain between latitudes 50 and 38°N, at depths between 800 and 1,000 m. It reaches a length of 63 cm. The highfin dogfish is ovoviviparous. References * External links ''Centroscyllium excelsum'' at zipcodezoo Centroscyllium Fish described in 1990 {{Shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shirai Shigeru
is a Japanese ichthyologist specializing in elasmobranchs, especially sharks. He graduated from Hokkaido University's Laboratory of Marine Zoology with a PhD in Fisheries Science. He is an editor of Japan's ''Ichthyological Research ''Ichthyological Research'' is a quarterly peer-reviewed scientific journal covering various aspects of ichthyology research. It is published by Springer Science+Business Media and was established in 1988. The editor-in-chief is Tomoyuki Kokita ...'' journal and author of the book, ''Squalean Phylogeny''. He died at the age of 63 on September 9, 2020. Taxon described by him *See :Taxa named by Shigeru Shirai References 4. 白井 滋さんを偲んでJapanese Society for Elasmobranch Studies Vol.53. March 2021. Japanese ichthyologists Japanese scientists Living people Year of birth missing (living people) {{japan-scientist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kazuhiro Nakaya
is a Japanese marine scientist and ichthyologist. He graduated from Hokkaido University with a BA in 1968 and with a PhD in 1972. He is professor of Marine Environment and Resources at the Marine Laboratory for Biodiversity. He specializes in taxonomy and evolution of sharks, rays, chimaeras, and Lake Tanganyikan fish. He is the author of many articles and books on sharks and fish. In 1995 he was put in charge of dissecting and preparing the 7th specimen of the very rare megamouth shark. Research Field New species described by Nakaya and colleagues Family Scyliorhinidae (Cat sharks) Whitebody catshark ('' Apristurus albisoma'' Nakaya & Séret, 1999)br /> Largehead catshark ('' Apristurus ampliceps'' Sasahara, Sato & Nakaya, 2008) Catshark ('' Apristurus aphyodes'' Nakaya & Stehmann, 1998) Southern catshark ('' Apristurus australis'' Sato, Nakaya & Yorozu, 2008) Shortbelly catshark (''Apristurus breviventralis'' Kawauchi, Weigmann & Nakaya, 2014) Softbody catshark ('' Apri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sleeper Shark
The Somniosidae are a family of sharks in the order Squaliformes, commonly known as sleeper sharks. The common name ''"sleeper shark"'' comes from their slow swimming, low activity level, and perceived non-aggressive nature. Distribution and habitat The Somniosidae can be found in: *Arctic to subantarctic waters *Shelves in cold waters *Continental and slopes *Temperate and tropical waters Diet Beaks recovered from the stomachs of sleeper sharks suggest they feed on colossal squid.Cherel, Y. & G. Duhamel 2004. ''Deep-Sea Research Part I'' 51: 17–31. Genera and species * ''Centroscymnus'' Barbosa du Bocage & Brito Capello, 1864 ** '' Centroscymnus coelolepis'' Barbosa du Bocage & Brito Capello, 1864 (Portuguese dogfish) ** '' Centroscymnus owstonii'' Garman, 1906 (roughskin dogfish) * '' Centroselachus'' Garman, 1913 ** '' Centroselachus crepidater'' Barbosa du Bocage & Brito Capello, 1864 (longnose velvet dogfish) * '' Scymnodalatias'' Garrick, 1956 ** '' Scymnodala ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etmopteridae
The Etmopteridae are a family of sharks in the order Squaliformes, commonly known as lantern sharks. Their name comes from the presence of light-producing photophores on their bodies. The members of this family are small, under long, and are found in deep waters worldwide. The 45 species are placed in five genera. Three-quarters of the species are in the genus ''Etmopterus''. Genera * '' Aculeola'' * ''Centroscyllium ''Centroscyllium'' is a genus of big-eyed, deepwater dogfishes with no anal fin, a grey or black-brown body, and dorsal spines, with the second one being much larger than the first. Seven extant species are described. Species * '' Centroscyll ...'' * '' Etmopterus'' * †'' Paraetmopterus'' * '' Trigonognathus'' References {{Taxonbar, from=Q720466 Shark families Taxa named by Henry Weed Fowler ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Ocean
The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continents of Asia and Oceania in the west and the Americas in the east. At in area (as defined with a southern Antarctic border), this largest division of the World Ocean—and, in turn, the hydrosphere—covers about 46% of Earth's water surface and about 32% of its total surface area, larger than Earth's entire land area combined .Pacific Ocean . '' Britannica Concise.'' 2008: Encyclopædia Britannica, Inc. The centers of both the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emperor Seamount
An emperor (from la, imperator, via fro, empereor) is a monarch, and usually the sovereign ruler of an empire or another type of imperial realm. Empress, the female equivalent, may indicate an emperor's wife ( empress consort), mother (empress dowager), or a woman who rules in her own right and name (empress regnant). Emperors are generally recognized to be of the highest monarchic honor and rank, surpassing kings. In Europe, the title of Emperor has been used since the Middle Ages, considered in those times equal or almost equal in dignity to that of Pope due to the latter's position as visible head of the Church and spiritual leader of the Catholic part of Western Europe. The Emperor of Japan is the only currently reigning monarch whose title is translated into English as "Emperor". Both emperors and kings are monarchs or sovereigns, but both emperor and empress are considered the higher monarchical titles. In as much as there is a strict definition of emperor, it is that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
50th Parallel North
The 50th parallel north is a circle of latitude that is 50 degrees north of the Earth's equatorial plane. It crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean. At this latitude the sun is visible for 16 hours, 22 minutes during the summer solstice and 8 hours, 4 minutes during the winter solstice. The maximum altitude of the sun during the summer solstice is 63.44 degrees and during the winter solstice it is 16.56 degrees. During the summer solstice, nighttime does not get beyond astronomical twilight, a condition which lasts throughout the month of June. Everyday of the month of May can view both astronomical dawn and dusk. At this latitude, the average sea surface temperature between 1982 and 2011 was about 8.5 °C (47.3 °F). Around the world Starting at the Prime Meridian and heading eastwards, the parallel 50° north passes through: : Sakhalin island From the signing of the 1875 Treaty of Saint Petersburg until the Russo- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
38th Parallel North
The 38th parallel north is a circle of latitude that is 38 degrees north of the Earth's equatorial plane. It crosses Europe, the Mediterranean Sea, Asia, the Pacific Ocean, North America, and the Atlantic Ocean. The 38th parallel north formed the border between North and South Korea prior to the Korean War. At this latitude, the Sun is visible for 14 hours, 48 minutes during the summer solstice and 9 hours, 32 minutes during the winter solstice. Around the world Starting at the Prime Meridian heading eastward, the 38th parallel north passes through: : Korea Japan had ruled the Korean peninsula between 1910 and 1945. When Japan surrendered in August 1945, the 38th parallel was established as the boundary between Soviet and American occupation zones. This parallel divided the Korean peninsula roughly in the middle. In 1948, this parallel became the boundary between the Democratic People's Republic of Korea (North Korea) and the Republic of Korea (South Korea), both ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ovoviviparous
Ovoviviparity, ovovivipary, ovivipary, or aplacental viviparity is a term used as a "bridging" form of reproduction between egg-laying oviparous and live-bearing viviparous reproduction. Ovoviviparous animals possess embryos that develop inside eggs that remain in the mother's body until they are ready to hatch. The young of some ovoviviparous amphibians, such as '' Limnonectes larvaepartus'', are born as larvae, and undergo further metamorphosis outside the body of the mother. Members of genera '' Nectophrynoides'' and '' Eleutherodactylus'' bear froglets, not only the hatching, but all the most conspicuous metamorphosis, being completed inside the body of the mother before birth. Among insects that depend on opportunistic exploitation of transient food sources, such as many Sarcophagidae and other carrion flies, and species such as many Calliphoridae, that rely on fresh dung, and parasitoids such as tachinid flies that depend on entering the host as soon as possible ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centroscyllium
''Centroscyllium'' is a genus of big-eyed, deepwater dogfishes with no anal fin, a grey or black-brown body, and dorsal spines, with the second one being much larger than the first. Seven extant species are described. Species * '' Centroscyllium excelsum'' Shirai & Nakaya, 1990 (highfin dogfish) * '' Centroscyllium fabricii'' J. C. H. Reinhardt, 1825 (black dogfish) * '' Centroscyllium granulatum'' Günther, 1887 (granular dogfish) * '' Centroscyllium kamoharai'' T. Abe, 1966 (bareskin dogfish) * '' Centroscyllium nigrum'' Garman, 1899 (combtooth dogfish) * ''Centroscyllium ornatum'' Alcock Alcock is a surname. Notable people with the surname include: Notable people with the surname Alcock * Alfred William Alcock, British naturalist * C. W. Alcock, British sports administrator and creator of the FA Cup * Charles R. Alcock, American ..., 1889 (ornate dogfish) * '' Centroscyllium ritteri'' Jordan & Fowler, 1903 (whitefin dogfish) References Shark genera Tax ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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