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Registros recuperados: 34
Primeira ... 12 ... Última
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A new genus and species of characid fish from the Amazon basin: the recognition of a relictual lineage of characid fishes (Ostariophysi: Cheirodontinae: Cheirodontini) Neotropical Ichthyology
Bührnheim,Cristina M.; Carvalho,Tiago P.; Malabarba,Luiz R.; Weitzman,Stanley H..
Amazonspinther dalmata, a new miniature characid from the streams of rio Purus and rio Madeira, right bank tributaries of the rio Amazonas, is described as a new genus and species of the subfamily Cheirodontinae. The unique characters of the new genus and species are the three remarkable black blotches on the base of the dorsal, anal, and caudal fins, the anteriormost proximal radial of the anal fin with an anteriorly extended lamina entering the abdominal cavity, and the extremely elongate caudal peduncle. The reduced number of ventral procurrent caudal-fin rays (7-9), and the hemal spines of only posterior one, two, or sometimes three caudal vertebrae directly articulating with the ventral procurrent caudal-fin rays further diagnoses the new taxon from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phylogeny; Biogeography; Miniaturization; Spintherobolus; Priocharax.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400016
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A new mouth brooder species of Gymnogeophagus with hypertrophied lips (Cichliformes: Cichlidae) Neotropical Ichthyology
Turcati,Andréia; Serra-Alanis,Wilson Sebastián; Malabarba,Luiz R..
ABSTRACT A new mouth breeder species of Gymnogeophagus is described from a tributary of the río Uruguay. It is distinguished from most species of the genus by the presence of hypertrophied lips, and from G. labiatus and G. pseudolabiatus by the color pattern. The presence of successive allopatric species of the Gymnogeophagus gymnogenys clade inhabiting the tributaries of the río Uruguay is discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Distribution; Endemism; Gymnogeophagus gymnogenys clade; New species; Río Uruguay.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400218
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A new species of Bryconops (Teleostei: Characidae) from the rio Madeira basin, Northern Brazil Neotropical Ichthyology
Wingert,Juliana M.; Malabarba,Luiz R..
A new species of Bryconops is described from a tributary to the rio Madeira in the Amazon basin, State of Rondônia, Brazil. Bryconops piracolina belongs to the subgenus Bryconops by having no teeth or rarely one tooth in the maxilla, and a naked area on cheek between the second and third infraorbitals. The new species is distinguished from all species of this subgenus by the presence of a large black blotch on dorsal-fin base. Furthermore, it is distinguished from all congeners, except B. inpai, by possessing the adipose fin entirely black. It differs from B. inpai by the lack of humeral spots. It further differs from all species of the subgenus Bryconops, except B. caudomaculatus, by having the last scales of the longitudinal series of scales that bears...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bryconops caudomaculatus; Neotropical; Systematics; Taxonomy.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300002
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A new species of Gymnogeophagus Miranda Ribeiro from Uruguay (Teleostei: Cichliformes) Neotropical Ichthyology
Loureiro,Marcelo; Zarucki,Matías; Malabarba,Luiz R.; González-Bergonzoni,Iván.
ABSTRACT We describe a new species of a substrate-brooding Gymnogeophagus , based on coloration characters. The new species can be distinguished from the remaining substrate-brooding species in the genus by the unique pigmentation of the dorsal fin which consists of light blue, diagonal stripes over a red background in the spiny section and a combination of round, elliptic, and elongated bright blue spots over a red background in the soft section. It can be further distinguished from all other species of Gymnogeophagus by the following combination of characters: a discontinuous bright blue band above the upper lateral line in the humeral area, light blue roundish spots over a red to orange background on the anal fin, and conspicuous bright blue horizontal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cichlidae; Gymnogeophagus meridionalis; Gymnogeophagus rhabdotus; Substrate brooding; Systematics.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100215
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A new species of Hemibrycon (Teleostei: Characiformes: Characidae) from the río Ucayali drainage, Sierra del Divisor, Peru Neotropical Ichthyology
Bertaco,Vinicius A.; Malabarba,Luiz R.; Hidalgo,Max; Ortega,Hernán.
A new characid species, Hemibrycon divisorensis, is described from the río Ucayali drainage, Loreto, Peru. The new species is distinguished from all Hemibrycon species by the presence of a wide black asymmetrical spot covering base of caudal-fin rays and extending along entire length of caudal-fin rays 9 to 12-13 (except from H. surinamensis), and a black band in the lower half of the caudal peduncle extending from the region above the last anal-fin rays to the caudal-fin base. Furthermore, it is distinguished from most species of the genus by the number of scale rows below the lateral line (4-5 vs 5-9), except H. jabonero, H. microformaa, H. orcesi, and H. surinamensis. It differs from these species by scale and fin ray counts and color pattern. The lack...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropical; Amazon basin; Taxonomy; Supraorbital; Fin hooks; Carlastyanax.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300003
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A new species of Hyphessobrycon (Teleostei: Characidae) from the upper rio Tocantins drainage, with bony hooks on fins Neotropical Ichthyology
Bertaco,Vinicius A.; Malabarba,Luiz R..
A new species of characid, Hyphessobrycon hamatus, is described from the upper rio Tocantins, Goiás, Brazil. The new species is distinguished from all other Hyphessobrycon species by the presence of bony hooks on dorsal, anal, pelvic, and pectoral fins of males, the two black humeral spots, the 4 or 5 teeth in the inner series of the premaxilla, a maxilla with 2-3 teeth, the iii-v, 16-18 anal-fin rays, and a lateral line with 10-32 perforated scales and 33-35 scales in a longitudinal series.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropical; Hyphessobrycon balbus; Taxonomy; Systematics.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000100004
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A new species of Serrapinnus Malabarba, 1998 (Characidae: Cheirodontinae) from Rio Grande do Norte State, northeastern Brazil Neotropical Ichthyology
Jerep,Fernando C.; Malabarba,Luiz R..
Serrapinnus potiguar, new species, is described from the rio Ceará-Mirim, a coastal drainage in the Rio Grande do Norte State, northeastern Brazil. The new species is distinguished from the other species of the genus by the shape and arrangement of the ventral procurrent caudal-fin rays of the sexually dimorphic males; where the hypertrophied elements present the shape of a series of scimitars arranged radially, forming a semi-circle on the ventral margin of the caudal peduncle. Furthermore, the new species is diagnosed from S. heterodonand S. piaba, sympatric congeners from the northeastern Brazilian drainages, respectively by the presence of incomplete lateral line and teeth bearing at most five cusps.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cheirodontini; Neotropics; Sexual Dimorphism; Taxonomy.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200301
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A new species of the characid genus Hollandichthys Eigenmann from coastal rivers of southern Brazil (Teleostei: Characiformes) with a discussion on the diagnosis of the genus Neotropical Ichthyology
Bertaco,Vinicius A.; Malabarba,Luiz R..
Hollandichthys taramandahy, new species, is described from the rio Tramandaí, rio Mampituba, and rio Araranguá basins, coastal drainages of Rio Grande do Sul and Santa Catarina States, Brazil. The new species is distinguished from H. multifasciatus, the single recognized species of the genus, by the presence of a small black spot covering the base of median caudal-fin rays, by the lower number of dorsal and ventral procurrent caudal-fin rays, by the absence of a black spot located along anterior half of adipose-fin, and by the absence of humeral spot in specimens larger than 60 mm of standard length. Comments about the geographic distribution and diagnosis are provided for the genus.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic Forest; Lambari-listrado; Neotropical Fish; Pseudochalceus; Rachoviscus.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000400767
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A new stem fossil characid (Teleostei: Ostariophysi) from the Eocene-Oligocene of southeastern Brazil Neotropical Ichthyology
Weiss,Fernanda E.; Malabarba,Maria Claudia; Malabarba,Luiz R..
A new characiform is herein described from the Eocene-Oligocene sediments exposed in the Aiuruoca basin, in southern Minas Gerais State, Brazil. Recently, two other characid species were described for this same fossil level: †Paleotetra aiuruoca and †Paleotetra entrecorregos. The holotype of this new characiform is represented by an articulated specimen preserved as part and counterpart, in which the most anterior part of the head is missing, including the jaws. Despite the lack of the diagnostic characters from the snout, a unique combination of characters allows its differentiation from other Neotropical characiforms, raising a new genus and species: †Bryconetes enigmaticus. Among these characters are: the presence of a supraorbital, dentary with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aiuruoca; Eocene; Paleotetra; Stem-group; Supraorbital.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200439
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A review of the Cis-Andean species of Hemibrycon Günther (Teleostei: Characiformes: Characidae: Stevardiinae), with description of two new species Neotropical Ichthyology
Bertaco,Vinicius A.; Malabarba,Luiz R..
The species of Hemibrycon occurring in the east of the Andean Cordilleras are reviewed based on their type series and additional specimens. Nine species are redescribed: H. beni from río Beni basin, Bolivia; H. helleri from the upper rio Ucayali, Peru; H. huambonicus from the ríos Huallaga and Marañon basins, Peru; H. jeslkii from the upper portions of ríos Marañon, Ucayali and Madeira basins, Bolivia, Brazil, and Peru; H. metae from río Orinoco basin, Colombia and Venezuela, and Caribbean coastal basins of Venezuela; H. polyodon (type species) from río Pastaza basin, Ecuador; H. surinamensis from coastal basins of French Guiana and Suriname, and from lower rios Tapajós, Tocantins and Xingu basins, Brazil; H. taeniurus from river basins from Trinidad...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropical; Taxonomy; Boehlkea; Bryconamericus; Freshwater fish.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400005
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Alterações histológicas em placas ósseas do peixe cascudo Rineloricaria strigilata (Hensel) (Teleostei, Loricariidae) e sua freqüência no lago Guaíba, Rio Grande do Sul, Brasil Zoologia
Flores-Lopes,Fábio; Malabarba,Luiz R.; Pereira,Edson H.L.; Silva,José F. Pezzi da.
Little information is available about natural populations of fishes exposed to polluted waters in Brazil. Contaminants may be lethal or predispose fishes to sickness, being the analysis of aquatic organisms a good indicator of environmental quality. The violinha, Rineloricaria strigilata (Hensel, 1868), is a common loricariid catfish in the Guaíba lake basin, Rio Grande do Sul, Brazil, and has been selected as a bioindicator for being resident, occurring in more than 50% of the samples, and by showing externally detectable neoplasies. These are characterized by its dark pigmentation, bony plates hypertrophy, and hypertrophy and irregular arrangement of the odontodes. Histology showed hypertrophied epitelial tissues, with an increased number of secretory...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Rineloricaria strigilata; Bioindicator; Neoplasm.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000300006
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Austrolebias paucisquama (Cyprinodontiformes: Rivulidae), a new species of annual killifish from southern Brazil Neotropical Ichthyology
Ferrer,Juliano; Malabarba,Luiz R.; Costa,Wilson J. E. M..
Austrolebias paucisquama is described from the rio Vacacaí drainage, a tributary to the rio Jacuí, Rio Grande do Sul, Brazil. The new species belongs to the Austrolebias alexandri species-group, by sharing the apomorphic bright blue iridescence and dark gray pectoral fins in males. It is distinguished from other species of this group by having fewer scales around caudal peduncle (12) and fewer dorsal-fin rays in males (17-21). The lack of contact organs on the inner surface of the pectoral fin in males and the color pattern of females - ground color light brownish, sides of body with a variable number of relatively large dark black spots distributed mostly on posterior portion of body - distinguish A. paucisquama from all other species of the genus.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Systematics; Austrolebias alexandri species-group; Endangered species.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200004
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Brachyhypopomus draco, a new sexually dimorphic species of Neotropical electric fish from southern South America (Gymnotiformes: Hypopomidae) Neotropical Ichthyology
Giora,Julia; Malabarba,Luiz R.; Crampton,William.
Brachyhypopomus draco, new species, is described from central, southern and coastal regions of Rio Grande do Sul state, Brazil, and Uruguay. It is diagnosed from congeners by, among other characters, the shape of the distal portion of the caudal filament in mature males, which during the reproductive period forms a distinct paddle shape structure.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Electric Organ Discharge; EOD; Rio Uruguay; Laguna dos Patos; Rio Tramandaí.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200002
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Comparative morphology of gill glands in externally fertilizing and inseminating species of cheirodontine fishes, with implications on the phylogeny of the family Characidae (Actinopterygii: Characiformes) Neotropical Ichthyology
Oliveira,Cristina L. C. de; Malabarba,Luiz R.; Burns,John R..
The structure and form of gill gland among inseminating and externally fertilizing species of the Cheirodontinae are described under light microscopy, scanning electron microscopy, and transmission electron microscopy, and compared to other members of the family Characidae. At least one species from thirteen cheirodontine genera were analyzed, totaling seventeen species. Gill glands were found in all analyzed mature males of Cheirodontinae and were always absent in females, being located on the anteriormost portion of the lower branch of the first gill arch, extending posteriorly through a variable number of gill filaments. Gill glands of all cheirodontines and of all characid species in which this organ has been described possess the same structure, being...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Characid clade A; Characid clade B; Gill filaments; Gill secondary lamellae.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200010
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Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system Neotropical Ichthyology
Rosa,Renata da; Rubert,Marceléia; Malabarba,Luiz R.; Martins-Santos,Isabel Cristina; Giuliano-Caetano,Lucia.
The genus Astyanax is prominent among Characiformes, due to the large number of species found and its wide geographic distribution. In this work, Astyanax laticeps specimens from the laguna dos Patos system were cytogenetically analyzed. A diploid number of 2n = 50 chromosomes distributed into 6m+16sm+16st+12a (FN = 88) was found, without differences between males and females. A few small heterochromatin blocks were observed, besides three more conspicuous C-bands, corresponding to NORs, as confirmed by silver nitrate and CMA3 staining, FISH, and DAPI negative staining. These regions were located in a medium-sized subtelocentric and in a large subtelocentric chromosomal pair, probably because of a deletion of this region in one homologous chromosome, or...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Astyanax scabripinnis species complex; RDNA; Homologous transposition.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400007
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Cytogenetic study of two species of the family Pimelodidae (Siluriformes) collected in lago Guaíba, Rio Grande do Sul, Brazil Neotropical Ichthyology
Treco,Fernando Rodrigo; Malabarba,Luiz R.; Giuliano-Caetano,Lucia; Dias,Ana Lúcia.
A cytogenetic study was conducted on specimens of Parapimelodus nigribarbis and Pimelodus maculatus collected in the lago Guaíba drainage, Porto Alegre, Rio Grande do Sul, Brazil. The two species had a diploid number of 56 chromosomes, with P. nigribarbis showing a karyotype of 20m + 20sm + 4st + 12a with FN of 100, and P. maculatus showing a karyotype of 24m + 20sm + 6st + 6a with FN of 106. NORs were demonstrated in both species in only one pair of subtelocentric chromosomes, in the terminal region of the long arm, which was coincident with C- banding and CMA3 staining, while DAPI staining was negative in these regions. Parapimelodus nigribarbis had a greater number of heterochromatic bands than did P. maculatus, which were distributed mainly in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Parapimelodus; Pimelodus; NOR; Heterochromatin; Fluorochromes.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100010
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Descriptions of five new species of the Neotropical cichlid genus Gymnogeophagus Miranda Ribeiro, 1918 (Teleostei: Cichliformes) from the rio Uruguay drainage Neotropical Ichthyology
Malabarba,Luiz R.; Malabarba,Maria Claudia; Reis,Roberto E..
ABSTRACT Gymnogeophagus is a Neotropical cichlid genus distributed in the río Paraguay, rio Paraná and rio Uruguay drainages and also in the coastal rivers of Uruguay and southern Brazil. Its monophyly is supported by two derived features: the absence of supraneurals and the presence of a forward spine in the first dorsal-fin pterygiophore. Herein, five new species of Gymnogeophagus are described from middle to upper tributaries of the rio Uruguay drainage and from the rio Negro. All these new species belong to a clade, which includes G. gymnogenys , easily recognized by sharing two synapomorphies: the absence of an oblique bar between the dorsal border of the eye and the nape, and the possession of a black bar originating in the dorsal contour near the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geophagini; Gymnogeophagus gymnogenys; Hypertrophied lips; Key of identification; Mouthbrooder cichlid.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000400637
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Hyphessobrycon melanopleurus uruguayensis Messner, 1962, an available name and a senior synonym of Cyanocharax macropinna Malabarba & Weitzman, 2003 (Ostariophysi: Characidae) Neotropical Ichthyology
Malabarba,Luiz R.; Weitzman,Stanley H.; Litz,Thomas.
Hyphessobrycon melanopleurus uruguayensis, Astyanacinus platensis, and Astyanax stenohalinus, published in a mimeographed paper by Messner in 1962 are considered available names. The subspecific name H. melanopleurus uruguayensis is recognized as a senior synonym of Cyanocharax macropinna Malabarba & Weitzman, 2003, and therefore referred to as Cyanocharax uruguayensis (Messner, 1962), new combination.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Astyanacinus platensis; Astyanax stenohalinus; Cyanocharax uruguayensis.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000200007
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Ictiofauna de aguas continentales Chilenas Neotropical Ichthyology
Malabarba,Luiz R..
Tipo: Info:eu-repo/semantics/article
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000400013
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New Hyphessobrycon from the upper rio Pardo drainage in eastern Brazil (Teleostei: Characiformes: Characidae) Neotropical Ichthyology
Bertaco,Vinicius A.; Malabarba,Luiz R.; Dergam,Jorge A..
A new species of characid, Hyphessobrycon vinaceus, is described from the upper rio Pardo, Minas Gerais, Brazil. The new species is distinguished from all other Hyphessobrycon species by the combination of the following characters: the body red or reddish pigmented in live specimens, an anterior and conspicuous vertically elongate black humeral spot followed by a second faint humeral spot, 5 teeth in the inner series of premaxilla, maxilla with 2-3 pentacuspidate teeth, 15-17 branched anal-fin rays, 4-5 scale rows above and 3-4 scale rows below lateral line, lateral line with 10-26 perforated scales, 32-34 scales in a longitudinal series, and by a smaller head length in relation to standard length (23.9-26.7%).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hyphessobrycon hamatus; Taxonomy; Fin hooks; Sexual dimorphism.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300002
Registros recuperados: 34
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