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African Knifefish
The African knifefish, ''Gymnarchus niloticus'' – also called the ''aba aba'' – is an electric fish, living at the bottoms of rivers and lakes. It is the only species in the genus ''Gymnarchus'' and the family Gymnarchidae, within the order Osteoglossiformes. It is a long slender fish with no pelvic or anal fins, and a tail fin shaped like a rat's tail. It swims using its elongated dorsal fin, allowing it to keep its body straight while it moves. This in turn enables it to produce a steady but weak electric field, which it uses to locate its prey. It is large for a river fish; adults can reach 1.6 m (5.2 ft) in length and 19 kg (42 lb) in weight. In 1950, Hans Lissmann noticed that the fish could swim equally well forwards or backwards, clearly relying on a sense other than vision. He demonstrated that it could locate prey by electroreception, making it the first fish known to have this ability. The fish is considered good to eat in West Africa, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pieter Bleeker
Pieter Bleeker (10 July 1819 – 24 January 1878) was a Dutch medical doctor, Ichthyology, ichthyologist, and Herpetology, herpetologist. He was famous for the ''Atlas Ichthyologique des Indes Orientales Néêrlandaises'', his monumental work on the fishes of East Asia published between 1862 and 1877. Life and work Bleeker was born on 10 July 1819 in Zaandam. He was employed as a medical officer in the Royal Netherlands East Indies Army from 1842 to 1860, (in French). stationed in the Dutch East Indies (now Indonesia). During that time, he did most of his ichthyology work, besides his duties in the army. He acquired many of his specimens from local fishermen, but he also built up an extended network of contacts who would send him specimens from various government outposts throughout the islands. During his time in Indonesia, he collected well over 12,000 specimens, many of which currently reside at the Naturalis Biodiversity Center in Leiden. Bleeker corresponded with Auguste Dum� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henri Émile Sauvage
Henri Émile Sauvage (22 September 1842 in Boulogne-sur-Mer – 3 January 1917 in Boulogne-sur-Mer) was a French paleontologist, ichthyologist, and Herpetology, herpetologist. He was a leading expert on Mesozoic fish and reptiles.Dinosaurs and Other Extinct Saurians: A Historical Perspective edited by Richard Moody He worked as a curator at the Muséum d'Histoire Naturelle in Boulogne-sur-Mer, and published extensively on Late Jurassic dinosaurs and other vertebrates from the Boulonnais (land area), Boulonnais region of northern France. He made important contributions involving vertebrate palaeontology in Portugal, describing in 1897, ''Suchosaurus, Suchosaurus girardi'' from jaw fragments found in that country. From 1883 to 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knifefish Continuous Waveform
Knifefish may refer to several knife-shaped fishes: *The Neotropical or weakly electric knifefishes, order Gymnotiformes, containing five families: **Family Gymnotidae (banded knifefishes and the electric eel) **Family Rhamphichthyidae (sand knifefishes) **Family Hypopomidae (bluntnose knifefishes) **Family Sternopygidae (glass and rat-tail knifefishes) **Family Apteronotidae (ghost knifefishes) *The featherbacks, family Notopteridae. *The aba, ''Gymnarchus niloticus'' *Four other unrelated fish species not in any of the above families: **Grey knifefish, ''Bathystethus cultratus''. **Blue knifefish The blue knifefish (''Labracoglossa nitida'') is a species of marine ray-finned fish, a member of the family Scorpididae. It is native to the Pacific Ocean waters off eastern Australia over to New Zealand, where it occurs at depths reaching fro ..., ''Labracoglossa nitida''. **Collared knifefish or finscale razorfish, ''Cymolutes torquatus''. ** Jack-knifefish, ''Equetus lanceolatus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnarchus
The African knifefish, ''Gymnarchus niloticus'' – also called the ''aba aba'' – is an electric fish, living at the bottoms of rivers and lakes. It is the only species in the genus ''Gymnarchus'' and the family Gymnarchidae, within the order Osteoglossiformes. It is a long slender fish with no pelvic or anal fins, and a tail fin shaped like a rat's tail. It swims using its elongated dorsal fin, allowing it to keep its body straight while it moves. This in turn enables it to produce a steady but weak electric field, which it uses to locate its prey. It is large for a river fish; adults can reach 1.6 m (5.2 ft) in length and 19 kg (42 lb) in weight. In 1950, Hans Lissmann noticed that the fish could swim equally well forwards or backwards, clearly relying on a sense other than vision. He demonstrated that it could locate prey by electroreception, making it the first fish known to have this ability. The fish is considered good to eat in West Africa, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gnathonemus Petersii
Peters's elephant-nose fish (''Gnathonemus petersii'') is an African freshwater elephantfish in the genus '' Gnathonemus''. Other names in English include elephantnose fish, long-nosed elephant fish, and Ubangi mormyrid, after the Ubangi River. The Latin name is probably for the German naturalist Wilhelm Peters. The fish uses electrolocation to find prey, and has the largest brain-to-body oxygen use ratio of all known vertebrates (around 0.6).Nilsson G (1996"Brain and body oxygen requirements of Gnathonemus petersii, a fish with an exceptionally large brain"''Journal of Experimental Biology'', 199(3): 603–607Download/ref> Description Peters's elephantnose fish is native to the rivers of West and Central Africa, in particular the lower Niger River basin, the Ogun River basin and the upper Chari River. It prefers muddy, slowly moving rivers and pools with cover such as submerged branches. The fish is a dark brown to black in colour, laterally compressed (averaging ), with a r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elephantfish Spike Waveform
Elephant fish may refer to: ; Fish * Callorhinchidae, a family of marine fish also known as elephant sharks or plough-nose chimaeras * Mormyridae The Mormyridae, sometimes called "elephantfish" (more properly freshwater elephantfish), are a superfamily of weakly electric fish in the order Osteoglossiformes native to Africa. It is by far the largest family in the order, with around 200 sp ..., a family of African freshwater fish that sometimes are kept in aquariums ; Other * Gajamina, an elephant-fish mythical figure used in funeral ceremonies in Bali, Indonesia {{disambiguation, fish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Organ (biology)
An Torpediniformes.html" ;"title="electric ray (Torpediniformes">electric ray (Torpediniformes) showing location of paired electric organs in the head, and electrocytes stacked within it In biology, the electric organ is an organ (biology), organ that an electric fish uses to create an electric field. Electric organs are derived from modified muscle or in some cases nerve tissue, called electrocytes, and have evolved at least six times among the Elasmobranchii, elasmobranchs and teleosts. These fish use their electric discharges for navigation, communication, mating, defence, and in strongly electric fish also for the incapacitation of prey. The electric organs of two strongly electric fish, the torpedo ray and the electric eel, were first studied in the 1770s by John Walsh, Hugh Williamson, and John Hunter. Charles Darwin used them as an instance of convergent evolution in his 1859 ''On the Origin of Species''. Modern study began with Hans Lissmann's 1951 study of electr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brain Research Reviews
''Brain Research'' is a peer-reviewed scientific journal focusing on several aspects of neuroscience. It publishes research reports and " minireviews". The editor-in-chief is Matthew J. LaVoie (University of Florida). Until 2011, full reviews were published in ''Brain Research Reviews'', which is now integrated into the main section, albeit with independent volume numbering. In 2006, four other previously established semi-independent journal sections ('' Cognitive Brain Research, Developmental Brain Research, Molecular Brain Research,'' and '' Brain Research Protocols'') were merged with ''Brain Research''. The journal has nine main subsections: * ''Cellular and Molecular Systems'' * ''Nervous System Development, Regeneration and Aging'' * ''Neurophysiology, Neuropharmacology and other forms of Intercellular Communication'' * ''Structural Organization of the Brain'' * ''Sensory and Motor Systems'' * ''Regulatory Systems'' * ''Cognitive and Behavioral Neuroscience'' * ''Disease-R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basal (phylogenetics)
In phylogenetics, basal is the direction of the ''base'' (or root) of a phylogenetic tree#Rooted tree, rooted phylogenetic tree or cladogram. The term may be more strictly applied only to nodes adjacent to the root, or more loosely applied to nodes regarded as being close to the root. Note that extant taxa that lie on branches connecting directly to the root are not more closely related to the root than any other extant taxa. While there must always be two or more equally "basal" clades sprouting from the root of every cladogram, those clades may differ widely in taxonomic rank, Phylogenetic diversity, species diversity, or both. If ''C'' is a basal clade within ''D'' that has the lowest rank of all basal clades within ''D'', ''C'' may be described as ''the'' basal taxon of that rank within ''D''. The concept of a 'key innovation' implies some degree of correlation between evolutionary innovation and cladogenesis, diversification. However, such a correlation does not make a given ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mormyroidea
The Mormyroidea (synonymy: Mormyriformes) are a superfamily (formerly an order) of fresh water fishes endemic to Africa that, together with the families ''Hiodontidae, Osteoglossidae, Pantodontidae'' and ''Notopteridae'', represents one of the main groups of living Osteoglossiformes. They stand out for their use of weak electric fields, which they use to orient themselves, reproduce, feed, and communicate. There is no consensus regarding its superior biological classification as some experts state that it belongs to the suborder '' Osteoglossoidei'', while others to the '' Notopteroidei''. In either case, the mormyriformes include the gymnarchids and mormyrids and represent the largest superfamily within the order ''Osteoglossiformes'' with about two hundred and thirty-three subordinate taxa that are distributed across various watersheds existing throughout tropical Africa south of the Sahara, including the Nile, Turkana, Gambia, and northern South Africa. These fish have a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
