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Topic: Gymnotiformes

	Gymnotiformes - Wikipedia, the free encyclopedia
		The Gymnotiformes is a lineage of ostariophysan teleost electric fishes.
		The electric discharge is continuous, being generated day and night throughout the entire life of the individual.
		Gymnotiform fishes inhabit freshwater rivers and streams throughout the humid Neotropics, ranging from Guatemala to Northern Argentina.
	en.wikipedia.org /wiki/Gymnotiformes (210 words)

	gcarapo
		Gymnotiforms are concentrated in the Amazon drainage but have endemic species in the more northern Orinoco River and the more southern Rio de la Plata.
		Specific information on the fecundity of Gymnotiforms is unavailable primarily due to the lack of studies in the wild.
		Gymnotiform locomotion is so distinct that they are the prototypical species for a type of locomotion called gymnotiform movement.
	www.sbs.utexas.edu /bio354l/Projects/2000/benjamin_walther (1661 words)

	Evolution of electric fish families (Site not responding. Last check: 2007-11-05)
		A study of the Gymnotiformes in the French Guiana has shown that both a wave Eigenmannia virescens and several pulse species, Hypopomus beebei, Gymnotus carapo, and Gymnotus anguillaris, can all be found in the Renner River (Westby 1988).
		High-frequency wave Gymnotiformes, such as Apteronotus, were found in the rapid water of the stream, whereas low-frequency pulse Gymnotiformes, such as Hypopomus, were found in quiet creeks.
		Westby, G.M.W. The ecology, discharge diversity and predatory behavior of Gymnotiform electric fish in the coastal streams of French Guiana.
	cetus.ucsd.edu /people/Ana/elfish.html (1947 words)

	Gymnotus - Bibliography (Site not responding. Last check: 2007-11-05)
		Five new species of Gymnotus (Teleostei: Gymnotiformes) from an Upper Amazon floodplain, with descriptions of electric organ discharges and ecology.
		Redescription of Gymnotu coropinae (Gymnotiformes, Gymnotidae), an often misidentified species of Neotropical electric fish, with notes on natural history and electric signals.
		Redescription of Gymnotus carapo (Gymnotiformes: Gymnotidae), a rare species of electric fish from the lowland Amazon Basin, with descriptions of osteology, electric sgnals and ecology.
	www.flmnh.ufl.edu /gymnotus/bibliography2.htm (262 words)

	What is Electroception? (Site not responding. Last check: 2007-11-05)
		This Amazonian freshwater predator is not actually an eel, but a knifefish, or gymnotiform.
		Gymnotiformes are a lineage of fish that have evolved to exploit bioelectricity and electroception.
		Gymnotiformes generate an electric field of about 1 volt on a 24 hour basis.
	www.wisegeek.com /what-is-electroception.htm (401 words)

	[No title]
		Morphologically, gymnotiforms are quite distinct from other neotropical fish and are easily identifiable.
		Their representatives possess an elongeted and laterally compressed body shape, dorsal and caudal fins are absent, apteronotids have a reduced caudal fin as an autapomorphic condition.
		Phylogenetics analysis of South American Eletric Fishes (order Gymnotiformes) and the evolution of their electrogenic system: a synthesis based on morphology, eletrophysiology, and mitochondrial sequence data.
	www-heb.pac.dfo-mpo.gc.ca /congress/2004/Comm/48FernandesPrelimAnal.doc (534 words)

	Medscape MEDLINE search: Gymnotiformes
		Aperonotus leptorhynchus (Gymnotiformes) produces wave-like electric organ discharges distinguished by a high degree of constancy.
		Weakly electric gymnotiform fish specialize in the regulation and modulation of the action potentials that make up their multi-purpose electric signals.
		The electric organ discharge (EOD) of gymnotiform electric fish is controlled by a well-characterized neural circuit in the brainstem and spinal cord.
	search.medscape.com /uslclient/searchMedline.do?queryText=Gymnotiformes (1127 words)

	UMass Amherst: Biology Department -> Faculty -> Cristina Cox Fernandes
		A hallmark feature of Amazonian fish is that they adapt to extreme seasonal changes in habitat properties such as water level, oxygen availability, and space.
		I have also discovered a pronounced morphological sexual dimorphism in several species in the family Apteronotidae, the most diverse family of Gymnotiformes.
		Males of these species exhibit unusually long snouts, which had led them to be classified initially in genera separate from the females.
	www.bio.umass.edu /biology/faculty/cristina.phtml (1003 words)

	Gymnotiformes
		Gymnotiformes.--27 characters unambiguously diagnose the Gymnotiformes, 17 of which are unique and unreversed among the otophysan fishes:
		The American knifefishes (Teleostei: Gymnotiformes) are animportant component of the nocturnal ichthyofauna of Middle and South American freshwaters.
		Phylogenetic analysis of the South American electric fishes (Order Gymnotiformes) and the evolution of their electrogenic system: A synthesis based on morphology, electrophysiology, and mitochondrial sequence data.
	tolweb.org /tree?group=Gymnotiformes&contgroup=Ostariophysi (1669 words)

	Temperature induces gonadal maturation and affects electrophysiological sexual maturity indicators in Brachyhypopomus ...
		In Gymnotiformes of the tropical region, gonadal cycles have
		This is one of few studies of gonadal histology in Gymnotiformes.
		Franchina, C. Ontogeny of the electric organ discharge and the electric organ in the weakly electric pulse fish Brachyhypopomus pinnicaudatus (Hypopomidae, Gymnotiformes).
	jeb.biologists.org /cgi/content/full/207/11/1843 (5375 words)

	Information by Country - Search Result
		Albert, J.S. and R. Campos-da-Paz 1998 Phylogenetic systematics of Gymnotiformes with diagnoses of 58 clades: a review of available data.
		Campos-da-Paz, R. 1999 New species of Megadontognathus from the Amazon Basin, with phylogenetic and taxonomic discussions on the genus (Gymnotiformes: Apteronotidae).
		(Gymnotiformes: Apteronotidae), a sexually dimorphic fl ghost knifefish from the Pantanal, Western Brazil, with a note on the monophyly of A.
	filaman.ifm-geomar.de /Nomenclature/FamilyRefList.cfm?FamCode=545 (377 words)

	Publications
		Nesting and Parental Care in the Weakly Electric Fish, Gymnotus (Gymnotiformes: Gymnotidae) with Descriptions of Larval and Adult Electric Organ Discharges of Two Species.
		Hypopomus pinnicaudatus (Hypopomidae) a new species of gymnotiform fish from South America.
		The dorsal filament of the weakly electric Apteronotidae (Gymnotiformes, Teleostei) is specialized for electroreception.
	www.nbb.cornell.edu /neurobio/hopkins/publications.htm (1160 words)

	Gymnotiformes Terms and Definitions at www.MedicalGlossary.org
		A most popular species of research interest is the electric eel, ELECTROPHORUS electricus.
		Electrophorus - A genus of fish, in the family GYMNOTIFORMES, capable of producing an electric shock that immobilizes fish and other prey.
		The species Electrophorus electricus is also known as the electric eel, though it is not a true eel.
	www.medicalglossary.org /electric_fish_gymnotiformes_definitions.html (191 words)

	Wikinfo \| Catfish
		At present there are 35 catfish families, although this number is in constant flux due to taxonomic work on the order.
		They belong to a superorder called the Ostariophysi, which also includes the Cypriniformes, Characiformes, and Gymnotiformes (although some place Gymnotiformes as a sub-order of Siluriformes).
		All catfish, except members of Malapteruridae (electric catfish), posses a strong, hollow, bonified leading ray on their dorsal and pectoral fins, through which a stinging protein can be delivered if the fish is irritated.
	www.wikinfo.org /wiki.php?title=Catfish (308 words)

	Profile
		I have also discovered a pronounced morpholgical sexual dimorphism in several species in the family Apteronotidae, the most diverse family of Gymnotiformes.
		Males of these species exhibit unusually long snouts, which had led them to be classified intially in genera separate from the females.
		Cox Fernandes, C, Detrended Canonical Correspondence Analysis (DCCA) of the electric fish assemblages in the Amazon, Proceeding of the International Symposium of Biology of Tropical Fishes.
	myprofile.cos.com /cristinacox (1226 words)

	Hormonal Control of a (Site not responding. Last check: 2007-11-05)
		Partial teleost fish phylogeny showing the positions of the electric fish orders, Gymnotiformes (in South America) and Mormyriformes (in Africa).
		The order Notopteriformes may not be monophyletic, and African notopterids, which are electroreceptive, may be the sister group of Mormyriformes.
		Phylogeny for the order Gymnotiformes developed from studies based on cladistic analyses of morphological, physiological, and molecular data.
	instruct1.cit.cornell.edu /courses/bionb424/students/mep38/pagetwo.html (97 words)

	Best of the Web - What's New in Science For 3/11/2006
		Redescription of Gymnotiformes coatesi (Gymnotiformes, Gymnotidae) - Information on the article by William G. Crampton and James S. Albert.
		New Species of Gymnotus (Gymnotiformes, Teleostei) - Presents abstract of the article by James S. Abert, et.
		Phylogenetic Analysis of the South American Electric Fishes (Order Gymnotiformes) - Provides abstract of the article by Alves-Gomes JA, Orti G, Haygood M, Heiligenberg W, Meyer A. Redescription of Sternopygus obtusirostris (Gymnotiformes: Sternopygidae) - Information on the article by Willaim G. Crampton Kevin G. Hulen and James S. Albert.
	botw.org /new/Science/03112006.cfm (3342 words)

	Linhas de Pesquisa-Departamento de Biologia
		Presently, our work is concentrated on the fish groups Characiformes (lambaris, pacus), and the bioelectric Gymnotiformes (tuviras, sarapós).
		The cytogenetic models found in this fish fauna include different systems of sex chromosomes, occurrence of natural and artificial hybrids and triploids, complex groups of sibling species, and some groups presenting supernumerary chromosomes and different levels of ploidy and DNA content.
		Almeida-Toledo LF, Foresti F, Daniel MFZ and Toledo-Filho SA (2000) Sex chromosome evolution in fish: the formation of the neo-Y chromosome in Eigenmannia (Gymnotiformes).
	www.ib.usp.br /pesquisa/toledo.htm (304 words)

	BOTW Directory - Science > Biology > Plants and Animals > Animalia > Chordata > Fish > Bony > Actinopterygii > ...
		Gymnotiformes Electric Fish - Provides photos of member species and listing of families.
		Phylogenetic Analysis of the South American Electric Fishes (Order Gymnotiformes) - Provides abstract of the article by Alves-Gomes JA, Orti G, Haygood M, Heiligenberg W, Meyer A. Redescription of Apteronotus mariae and the Taxonomic Status of Apteronotus jurubidae [PDF] - Presents abstract and introduction of the article by Carlos David de Santana and Javier Maldonado-Ocampo.
		Redescription of Sternopygus obtusirostris (Gymnotiformes: Sternopygidae) - Information on the article by Willaim G. Crampton Kevin G. Hulen and James S. Albert.
	botw.org /top/Science/Biology/Plants_and_Animals/Animalia/Chordata/Fish/Bony/Actinopterygii/Gymnotiformes (347 words)

	Phylogenetic analysis of the South American electric fishes (order Gymnotiformes) and the evolution of their ...
		Phylogenetic analysis of the South American electric fishes (order Gymnotiformes) and the evolution of their electrogenic system: a synthesis based on morphology, electrophysiology, and mitochondrial sequence data -- Alves-Gomes et al.
		The order Gymnotiformes (South American electric fishes) is a fascinating
		Systematic biology of gymnotiform and mormyriform electric fishes: phylogenetic relationships, molecular clocks and rates of evolution in the mitochondrial rRNA genes
	mbe.oxfordjournals.org /cgi/content/abstract/12/2/298 (526 words)

	What is an Eel?
		More information about wolf eels can be found here.
		Electric "eels" are members of the Family Electrophoridae in the Order Gymnotiformes or knifefish.
		An interesting thing about this order is that their closest relatives are in the catfish order, the Siluriformes.
	www.whozoo.org /fish/teleosts/eels.htm (338 words)

	Knifefish, Knifefishes, Orders: Osteoglossiforms and Gymnotiformes
		Send us a a picture and/or description and we'll try to include it!
		Knifefish fall in two orders: Osteoglossiforms and Gymnotiformes.
		But just to confuse the issue, there are also a couple with the term 'knifefish' being used in their common name due to their body shape.
	animal-world.com /encyclo/fresh/Knifefish/Knifefish.php (736 words)

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