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Anacanthobatis
The spotted legskate (''Anacanthobatis marmorata'') is a species of cartilaginous fish, a ray belonging to the family Anacanthobatidae, the smooth skates. It is the only species in the monospecific genus ''Anacanthobatis''. It is found off Mozambique and South Africa. This is a demersal fish occurring on soft substrates on the continental shelf break and upper continental slope A continental margin is the outer edge of continental crust abutting oceanic crust under coastal waters. It is one of the three major zones of the ocean floor, the other two being deep-ocean basins and mid-ocean ridges. The continental margi ... at depths of . Classification The spotted legskate is the only species in its genus, previously several species have been assigned to this genus, but most are now placed in '' Sinobatis'', '' Springeria'', and '' Schroederobatis'', leaving only ''A. marmoratus'' in ''Anacanthobatis''. References External links Species Description of Anacanthobatis marmo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schroederobatis
The American legskate (''Schroederobatis americana'') is a species of cartilaginous fish, a ray, belonging to the family Anacanthobatidae, the smooth skates. It is the only species in the monotypic genus ''Schroederobatis''. This bathydemersal species is found in the southern Caribbean and off northern South America. Taxonomy The American legskate was first formally described in 1962 as ''Anacanthobatis americana'' by Henry Bryant Bigelow and William Charles Schroeder with its type locality given as between Grenada and Venezuela at 11°35'N, 62°41'W, from a depth of . In 1973 the South African ichthyologist P. Alexander Hulley proposed the subgenus ''Schroederobatis'', of the genus ''Anacanthobatis'' for ''A. americana'', and it remains the only species in that genus. Etymology The American legskate is the only species in the genus ''Schroederobatis'', an name honours Schroeder, the junior author of the description of this species, suffixing his name with ''-batis'', meaning ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anacanthobatidae
The Anacanthobatidae, the smooth skates or leg skates, are a family of skates found at depths below in the Indian, Pacific and Atlantic Oceans. They lack the dorsal denticles (sharp, tooth-like scales) of other rays, hence their name, from Greek ''an-'' meaning "without", ''acantha'' meaning "thorn", and ''bathys'' meaning "deep". They are bottom-dwelling fishes found on the continental slopes of tropical and subtropical The subtropical zones or subtropics are geographical zone, geographical and Köppen climate classification, climate zones immediately to the Northern Hemisphere, north and Southern Hemisphere, south of the tropics. Geographically part of the Ge ... waters. Genera Anacanthobatidae contains the following genera: References Anacanthobatidae {{Rajiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Springeria
''Springeria'' is a genus of cartilaginous fish belonging to the family Anacanthobatidae, the smooth skates. The two species in this genus are found in the central Western Atlantic. Taxonomy ''Springeria'' was first proposed as a monospecific genus in 1951 by the American biologists Henry Bryant Bigelow and William Charles Schroeder when they described ''Springeria folirostris''. ''Springeria foliorostris'' has its type locality given as the northern Gulf of Mexico off the mouth of the Mississippi at 29°02'N, 88°34'W from a depth between . This genus is classified within the family Anacanthobatidae which belongs to the order Rajiformes. Etymology ''Springeria'' honors the American ichthyologist Stewart Springer, who studied cartilaginous fishes in Florida and the Gulf of Mexico. Species ''Springeria'' contains the following two valid recognised species: * '' Springeria folirostris'' Bigelow & Schroeder, 1951 (Leaf-nose leg skate) * '' Springeria longirostris'' (Bigelow & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinobatis
''Sinobatis'' is a genus of rays in the family Anacanthobatidae native to deep water in the Indo-Pacific Ocean.Weigmann, S. (2016): Annotated checklist of the living sharks, batoids and chimaeras (Chondrichthyes) of the world, with a focus on biogeographical diversity. ''Journal of Fish Biology, 88 (3): 837-1037.'' Species Nine recognized species are in this genus: * '' Sinobatis andamanensis'' Last & Bussarawit, 2016 (Andaman legskate) Last, P.R. & Bussarawit, S. (2016): A new legskate, ''Sinobatis andamanensis'' (Rajiformes: Anacanthobatidae), from the Andaman Sea (northeastern Indian Ocean). ''Zootaxa, 4168 (1): 161-170.'' * '' Sinobatis borneensis'' ( W. L. Y. Chan, 1965) (Borneo legskate) * ''Sinobatis brevicauda'' Weigmann & Stehmann, 2016 (short-tail legskate) Weigmann, S. & Stehmann, M.F.W. (2016): ''Sinobatis brevicauda'' n. sp., a new deep-water legskate (Rajiformes, Anacanthobatidae) and first generic record from the western Indian Ocean. ''Zootaxa, 4137 (4): 478– ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cecil Von Bonde
Cecil von Bonde (born Cape Town 19 July 1895; died 21 March 1983) was a South African zoologist, fisheries scientist and oceanographer. Biography Von Bonde was born in Cape Town and matriculated at the Normal College Boys' High School, Cape Town, in 1912 before going on to the University of Cape Town where he attained his Master of Arts degree and was appointed as a Senior Lecturer in Zoology in 1918. He gained his Doctor of Philosophy (PhD) in zoology from the University of Cape Town in 1923, his thesis was "The zoogeographical distribution of the Heterosomata lat fishes. Between 1924 and 1925 he studied oceanography at the University of Liverpool, also serving as a lecturer in Zoology there. He returned to Cape Town in 1926 where he wa appointed as acting head of the Zoology Department following the death of Professor J.D.F. Gilchrist. He was appointed as Director of Fisheries and Government Marine Biologist in South Africa in 1928 when he was also seconded to the Conferen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cartilaginous Fish
Chondrichthyes (; ) is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fish'', which have skeletons primarily composed of bone tissue. Chondrichthyes are aquatic vertebrates with paired fins, paired nares, placoid scales, conus arteriosus in the heart, and a lack of opercula and swim bladders. Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates. The class is divided into two subclasses: Elasmobranchii (sharks, rays, skates and sawfish) and Holocephali ( chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class). Extant chondrichthyans range in size from the finless sleeper ray to the over whale shark. Anatomy Skeleton The skeleton is cartilaginous. The notochord is gradually replaced by a vertebral column during development, e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Monospecific Genus
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. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical system. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mozambique
Mozambique, officially the Republic of Mozambique, is a country located in Southeast Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west, and Eswatini and South Africa to the south and southwest. The sovereign state is separated from the Comoros, Mayotte, and Madagascar by the Mozambique Channel to the east. The capital and largest city is Maputo. Between the 7th and 11th centuries, a series of Swahili port towns developed on that area, which contributed to the development of a distinct Swahili culture and dialect. In the late medieval period, these towns were frequented by traders from Somalia, Ethiopia, Egypt, Arabia, Persia, and India. The voyage of Vasco da Gama in 1498 marked the arrival of the Portuguese Empire, Portuguese, who began a gradual process of colonisation and settlement in 1505. After over four centuries of Portuguese Mozambique, Portuguese rule, Mozambique Mozambican War of Indepen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Africa
South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic Ocean, South Atlantic and Indian Ocean; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; to the east and northeast by Mozambique and Eswatini; and it encloses Lesotho. Covering an area of , the country has Demographics of South Africa, a population of over 64 million people. Pretoria is the administrative capital, while Cape Town, as the seat of Parliament of South Africa, Parliament, is the legislative capital, and Bloemfontein is regarded as the judicial capital. The largest, most populous city is Johannesburg, followed by Cape Town and Durban. Cradle of Humankind, Archaeological findings suggest that various hominid species existed in South Africa about 2.5 million years ago, and modern humans inhabited the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Demersal Fish
Demersal fish, also known as groundfish, live and feed on or near the bottom of seas or lakes (the demersal zone).Walrond Carl . "Coastal fish - Fish of the open sea floor"Te Ara - the Encyclopedia of New Zealand. Updated 2 March 2009 They occupy the sea floors and lake beds, which usually consist of mud, sand, gravel or rocks. In coastal waters, they are found on or near the continental shelf, and in deep waters, they are found on or near the continental slope or along the continental rise. They are not generally found in the deepest waters, such as abyssal depths or on the abyssal plain, but they can be found around seamounts and islands. The word ''demersal'' comes from the Latin ''demergere'', which means ''to sink''. Demersal fish are bottom feeders. They can be contrasted with pelagic fish, which live and feed away from the bottom in the open water column. Demersal fish fillets contain little fish oil (one to four per cent), whereas pelagic fish can contain up to 30 p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Continental Shelf
A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods. The shelf surrounding an island is known as an "''insular shelf''." The continental margin, between the continental shelf and the abyssal plain, comprises a steep continental slope, surrounded by the flatter continental rise, in which sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of the slope. Extending as far as 500 km (310 mi) from the slope, it consists of thick sediments deposited by turbidity currents from the shelf and slope. The continental rise's gradient is intermediate between the gradients of the slope and the shelf. Under the United Nations Convention on the Law of the Sea, the name continental shelf was given a legal definition as the stretch of the seabed adjacent to the shores ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
