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Skate (fish)
Skates are Chondrichthyes, cartilaginous fish belonging to the family (biology), family Rajidae in the superorder Batoidea of Ray (fish), rays. More than 150 species have been described, in 17 genera. Arhynchobatidae, Softnose skates and Gurgesiellidae, 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 (anatomy), rostrum that is not reduced. Taxonomy and systematics Evolution Skates belong to the ancient lineage of cartilaginous fishes. Fossil Dermal denticle, denticles (tooth-like scales in the skin) resembling those of today's chondrichthyans date at least as far back as the Ordovician, with the oldest unambiguous fossils of cartilaginous fish dating from the m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Arctic Skate
The Arctic skate (''Amblyraja hyperborea'') is a species of fish in the family Rajidae. It lives near the seabed between 140 and 2,500 m deep in the Arctic Ocean and waters around Canada and northern and north-western Europe, in the northern Pacific Ocean, and in waters surrounding Antarctica and New Zealand. The Arctic skate is about 1 m long and is gray-brown with large dark spots. Its underside is white with dark patterns. It has thorns in line from back to near the end of its tail. It is oviparous; its egg (biology), eggs are capsules with hard horns on each corner. It eats all sorts of small animals at the bottom of the sea. Taxonomy This species was first described by Robert Collett in 1879 and named ''Raja hyperborea.'' Conservation The Arctic skate is classified as being of "least concern" by the IUCN Red List of Threatened Species. In New Zealand, the Department of Conservation (New Zealand), Department of Conservation has classified the Arctic skate as "Not Threat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Clade
In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach to taxonomy adopted by most biological fields. The common ancestor may be an individual, a population, or a species (extinct or Extant taxon, extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed ''monophyletic'' (Greek: "one clan") groups. Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming Taxon, taxa that are not clades; that is, taxa that are not Monophyly, monophyletic. Some of the relationships between organisms that the molecul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Hiroshi Senou
is a common masculine Japanese given name. It can also be transliterated as Hirosi. Written forms Hiroshi can be written using different kanji characters. Here are some examples: *浩, "wide expanse, abundance, vigorous" *弘, "vast, broad, wide" *宏, "wide, large" *寛, "tolerant, leniency, generosity, relax" *洋, "ocean, sea, foreign, Western style" *博, "large, wide, wise" *大, "large, big" *広志, "wide, broad, spacious" and "intention, plan, resolve, aspire, hopes" *博司, "large, wide, wise" and "director, official, govt office, rule, administer" *博史, "large, wide, wise" and "history, chronicle" People with the name *, Japanese comedian *Hiroshi Abe (other), multiple people *, Japanese actor *, Japanese astronomer * Hiroshi Abe (born 1922), Japanese war criminal *, Japanese Japanese physicist, engineer, Nobel Prize winner *, Japanese screenwriter and film director *, Japanese baseball player *, Japanese author, polymath, critic, translator *, Japanese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Peter H
Peter may refer to: People * List of people named Peter, a list of people and fictional characters with the given name * Peter (given name) ** Saint Peter (died 60s), apostle of Jesus, leader of the early Christian Church * Peter (surname), a surname (including a list of people with the name) Culture * Peter (actor) (born 1952), stage name Shinnosuke Ikehata, a Japanese dancer and actor * Peter (1934 film), ''Peter'' (1934 film), a film directed by Henry Koster * Peter (2021 film), ''Peter'' (2021 film), a Marathi language film * Peter (Fringe episode), "Peter" (''Fringe'' episode), an episode of the television series ''Fringe'' * Peter (novel), ''Peter'' (novel), a 1908 book by Francis Hopkinson Smith * Peter (short story), "Peter" (short story), an 1892 short story by Willa Cather * Peter (album), ''Peter'' (album), a 1972 album by Peter Yarrow * ''Peter'', a 1993 EP by Canadian band Eric's Trip * "Peter", 2024 song by Taylor Swift from ''The Tortured Poets Department, The Tort ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Michelle Treloar
Michelle may refer to: People *Michelle (name), a given name and surname, the feminine form of Michael * Michelle Courtens, Dutch singer, performing as "Michelle" * Michelle (German singer) * Michelle (Scottish singer) (born 1980), Scottish winner of ''Pop Idol'' in 2003 * Michel'le, American singer * Michelle (band), American band Arts, entertainment, and media Music * ''Michelle'' (album), a 1966 album by saxophonist Bud Shank * "Michelle" (song), a 1965 song by The Beatles * "Michèle" (song) by French singer Gérard Lenorman *"Michelle", a 2013 song by Beatallica from ''Abbey Load'' *"Michelle", a song from the Lynyrd Skynyrd compilation album ''Collectybles'' *"My Michelle", a 1987 song by Guns N' Roses *"A World Without You (Michelle)", a 1988 song by Bad Boys Blue Film * Michelle (Marvel Cinematic Universe), a fictional character of the Marvel Cinematic Universe Television * "Michelle" (''Skins'' series 1), a 2007 episode of the British teen drama ''Skins'' Science ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
August Wilhelm Malm
August Wilhelm Malm (23 July 1821 – 5 March 1882) was a Swedish zoologist, entomologist and malacologist. He was the first Director of the Gothenburg Natural History Museum. Biography August Wilhelm Malm was born in Lund, Sweden. Malm was generally self-taught without an academic degree. In the years 1838–1839, he was student and assistant of Sven Nilsson (1787–1883), professor of Natural History at Lund University. He worked from 1840 as an assistant of Carl Jakob Sundevall (1801–1875) at the Swedish Museum of Natural History The Swedish Museum of Natural History (), in Stockholm, is one of two major museums of natural history in Sweden, the other one being located in Gothenburg. The museum was founded in 1819 by the Royal Swedish Academy of Sciences, but goes bac ..., zoological department in Stockholm. He studied zoology in Copenhagen during 1843–44. From 1848, he was curator of the Gothenburg Natural History Museum (''Göteborgs Naturhistoriska Mus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Elasmobranchii
Elasmobranchii () is a subclass of Chondrichthyes or cartilaginous fish, including modern sharks ( division Selachii), and batomorphs (division Batomorphi, including rays, skates, and sawfish). Members of this subclass are characterised by having five to seven pairs of gill slits opening individually to the exterior, rigid dorsal fins and small placoid scales on the skin. The teeth are in several series; the upper jaw is not fused to the cranium, and the lower jaw is articulated with the upper. The details of this jaw anatomy vary between species, and help distinguish the different elasmobranch clades. The pelvic fins in males are modified to create claspers for the transfer of sperm. There is no swim bladder; instead, these fish maintain buoyancy with large livers rich in oil. The definition of the clade is unclear with respect to fossil chondrichthyans. Some authors consider it as equivalent to Neoselachii (the crown group clade including modern sharks, rays, and all o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Ray (fish)
Batomorphi is a division of cartilaginous fishes, commonly known as rays, this taxon is also known as the superorder Batoidea, but the 5th edition of ''Fishes of the World'' classifies it as the division Batomorphi. They and their close relatives, the sharks, compose the subclass Elasmobranchii. Rays are the largest group of cartilaginous fishes, with well over 600 species in 26 families. Rays are distinguished by their flattened bodies, enlarged pectoral fins that are fused to the head, and gill slits that are placed on their ventral surfaces. Anatomy Batomorphs are flat-bodied, and, like sharks, are cartilaginous fish, meaning they have a boneless skeleton made of a tough, elastic cartilage. Most batomorphs have five ventral slot-like body openings called gill slits that lead from the gills, but the Hexatrygonidae have six. Batomorph gill slits lie under the pectoral fins on the underside, whereas a shark's are on the sides of the head. Most batomorphs have a flat, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Sawfish
Sawfish, also known as carpenter sharks, are a family of very large rays characterized by a long, narrow, flattened rostrum, or nose extension, lined with sharp transverse teeth, arranged in a way that resembles a saw. They are among the largest fish, with some species reaching lengths of about . They are found worldwide in tropical and subtropical regions in coastal marine and brackish estuarine waters, as well as freshwater rivers and lakes. All species are critically endangered. They should not be confused with sawsharks (order Pristiophoriformes) or the extinct sclerorhynchoids (order Rajiformes) which have a similar appearance, or swordfish (family Xiphiidae) which have a similar name but a very different appearance. Sawfishes are relatively slow breeders and the females give birth to live young. They feed on fish and invertebrates that are detected and captured with the use of their saw. They are generally harmless to humans, but can inflict serious injuries with th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Shark
Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the Division (taxonomy), division Selachii and are the sister group to the Batoidea, Batomorphi (Batoidea, rays and skate (fish), skates). Some sources extend the term "shark" as an informal category including Extinction, extinct members of Chondrichthyes (cartilaginous fish) with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as ''Cladoselache'' and ''Doliodus'' first appeared in the Devonian Period (419–359 million years), though some fossilized chondrichthyan-like scales are as old as the Ordovician, Late Ordovician (458–444 million years ago). The earliest confirmed modern sharks (Selachii) are known from the Early Jurassic around , with the oldest known member being ''Agaleus'', though records of true shar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
