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Registros recuperados: 1.204
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Chromosomal characterization of the bonytongue Arapaima gigas (Osteoglossiformes: Arapaimidae) Neotropical Ichthyology
Marques,Debora Karla; Venere,Paulo Cesar; Galetti Junior,Pedro Manoel.
The mitotic chromosomes of the pirarucu Arapaima gigas inhabiting the middle Araguaia River and collected in the municipality of Araguaiana (MT, Brazil) were studied. The chromosomes were analyzed through Giemsa staining, C-banding, Ag-NOR staining and in situ hybridization using an 18S rRNA gene probe. The karyotype had 2n=56 comprising 14 biarmed and 14 uniarmed chromosome pairs in both sexes. No cytologically distinguishable sex chromosome was identified. A single NOR-bearing chromosome pair was detected by Ag-NOR staining and confirmed by 18S rDNA- FISH. Faint constitutive heterochromatin was C-banded in the centromeric region of some chromosomes.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pirarucu; Karyotype; RDNA; Heterochromatin.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200007
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Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changes Neotropical Ichthyology
Deprá,Gabriel de Carvalho; Ota,Renata Rúbia; Vitorino Júnior,Oscar Barroso; Ferreira,Katiane Mara.
ABSTRACT Two new species from the upper rio Tocantins basin are described in Knodus based on the traditional definition of the genus. The new species are distinguished from other congeners by meristic and morphometric characters, such as the number of cusps in the premaxillary and dentary teeth, the number of scale series between dorsal-fin origin and lateral line, the orbital diameter and the body depth. With the two new species, the number of endemic species in the upper rio Tocantins basin upstream of the mouth of the rio Paranã, rises to 53 (89 to the confluence with rio Araguaia). The existence of a meristic character that changes through ontogeny (allomery), viz. the number of scale series between dorsal-fin origin and lateral line, was detected in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allochromy; Allomery; Endemism; Knodus breviceps; Secondary sexual characters.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100208
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Induced spawning of the endangered Neotropical species Steindachneridion parahybae (Siluriformes: Pimelodidae) Neotropical Ichthyology
Caneppele,Danilo; Honji,Renato M.; Hilsdorf,Alexandre W. S.; Moreira,Renata G..
The "surubim do Paraíba" (Steindachneridion parahybae) is a freshwater catfish endemic to the Paraíba do Sul River basin, Brazil. This species has been seriously threatened by environmental disturbances in the last several decades. Wild Steindachneridion parahybae males and females were collected in 2003 and taken to the hatchery of a power plant of the Companhia Energética de São Paulo (CESP). Steindachneridion parahybae broodstocks were artificially induced to reproduce in December 2003 using a combination of carp pituitary extract (CPE) and human chorionic gonadotropin (hCG). Oocytes and milt were stripped; the fertilized eggs were transferred to 60-liter conical incubators and hatched larvae distributed in nine horizontal trays. Exogenous feed was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Surubim do Paraíba; Paraíba do Sul River; Artificial reproduction.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400026
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Spawning of migratory fish species between two reservoirs of the upper Uruguay River, Brazil Neotropical Ichthyology
Reynalte-Tataje,David A.; Nuñer,Alex P. O.; Nunes,Michele C.; Garcia,Valquíria; Lopes,Carolina A.; Zaniboni-Filho,Evoy.
This study investigated the migratory fish spawning within the reservoirs of the Machadinho and Itá dams (upper Uruguay River, Brazil) and its relationship to environmental variables. Sampling was conducted in the lotic region of the river in two sites between the dams' reservoirs: Uruguay (main river) and Ligeiro (tributary). Sampling included nine consecutive reproductive periods (RP) spanning the period from 2001 to 2010 and was conducted at night on the water surface using cylindrical-conical plankton nets (0.5 mm mesh); environmental variables were also recorded. The spawning of the migratory species Salminus brasiliensis, Prochilodus lineatus, and Steindachneridion scriptum was registered: S. brasiliensis and P. lineatus spawned in the tributary...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ichthyoplankton; Temporal distribution; Water flow; Water temperature.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400016
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The late Miocene Phractocephalus catfish (Siluriformes: Pimelodidae) from Urumaco, Venezuela: additional specimens and reinterpretation as a distinct species Neotropical Ichthyology
Lundberg,John G.; Aguilera,Orangel.
Based on additional specimens the fossil pimelodid catfish from the upper Miocene Urumaco Formation, Falcón State, Venezuela originally assigned to the extant species Phractocephalus hemioliopterus is described as a new, extinct species. †Phractocephalus nassi n. sp. is diagnosed by the following combination of characters: 1) posterior half of frontals and anterior half of supraoccipital with elongate, coarse ridges and sulci in addition to reticulating ridges and subcircular pits; 2) very broad and ornamented mesethmoid bone; 3) lateral ethmoid margin convex and eliminating orbital notch but not projecting far anteriorly over palatine condyle; 4) anterior cranial fontanelle closed or represented by a small pit; 5) supraoccipital process rounded laterally...
Tipo: Info:eu-repo/semantics/article Palavras-chave: †Phractocephalus nassi; Fossils; Urumaco Formation; Paleo-Amazon-Orinoco.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200004
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Flight response of the barber surgeonfish, Acanthurus bahianus Castelnau, 1855 (Teleostei: Acanthuridae), to spearfisher presence Neotropical Ichthyology
Benevides,Larissa J.; Nunes,José de Anchieta C. C.; Costa,Tiego L. A.; Sampaio,Cláudio L. S..
ABSTRACT When confronted by predators, prey need to make an economic decision between continuing their current activity or flee. Flight Initiation Distance (FID), the distance at which an organism begins to flee an approaching threat, has been used to indicate an animal's fearfulness level and a way to examine factors influencing escape decisions. Here we investigated how the FID of the barber surgeonfish, Acanthurus bahianus, responds to the presence of spearfishers in a fishing site in northeast Brazil. Specifically, we examined whether the FID was influenced by body and group size; by the heterogeneity of species in groups formation; and the distance to shelter. Significant differences in FID were observed with increasing body size. We found no...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antipredator behaviour; Brazil; Flight initiation distance; Rocky reefs; Spearfishing.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100219
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Patterns of energy allocation to reproduction in three Amazonian fish species Neotropical Ichthyology
Santos,Rodrigo N. dos; Amadio,Sidinéia; Ferreira,Efrem J. G..
The study considered the influence of the hydrological cycle and gonadal development on the accumulation and use of energy in three fish species from an Amazonian flooded area. Fishes were sampled over a 24 hour period at monthly intervals between July 2004 and June 2005 using gillnets of different mesh sizes. Body cavity fat and gonadosomatic indices were determined, as well as energy content of gonads and muscles. Amongst the studied species, different means of energy allocation for reproduction were found: Acestrorhynchus falcirostris allocate energy from body cavity fat to its gonads; Pygocentrus nattereri uses mainly energy accumulated in the muscles for the process of gonadal maturation; and Hoplosternum littorale uses energy accumulated in their...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazon floodplain; Energy contents; Hydrological cycle; Reproductive biology.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000100018
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Molecular diagnosis of the arowanas Osteoglossum ferreirai Kanazawa, 1966 and O. bicirrhossum (Cuvier, 1829) from the Orinoco and Amazon River basins Neotropical Ichthyology
L.,María Doris Escobar; Farias,Izeni P.; B.,Donald C. Taphorn; Landines,Miguel; Hrbek,Tomas.
The arowanas, fishes of Gondwanan origin, are represented in South America by the genus Osteoglossum. All species were initially reported as being exclusive to the Amazon region, with O. ferreirai restricted to the Negro River basin and O. bicirrhosum to the Amazon and Essequibo Rivers basin. Starting in the mid 1970's it was reported that O. ferreirai also occurs in the Orinoco River basin. In all regions the arowanas assumed significant socio-economic importance due to their popularity in the international ornamental fish trade, leading to over-exploitation of both species in some areas. The Orinoco populations are particularly heavily exploited, and thus conservation and management measures are needed. Both depend on the clarification of taxonomic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aruana; Biological introduction; Black arowana; Silver arowana.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200335
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Reproductive biology of the cockfish, Callorhinchus callorynchus (Chondrichthyes: Callorhinchidae), in coastal waters of the northern Argentinean Sea Neotropical Ichthyology
Chierichetti,Melisa A.; Scenna,Lorena B.; Giácomo,Edgardo E. Di; Ondarza,Paola M.; Figueroa,Daniel E.; Miglioranza,Karina S. B..
ABSTRACT The cockfish, Callorhinchus callorynchus, is a widely distributed holocephalan in the south-western Atlantic and an important resource for Argentinean fisheries. The reproductive characteristics of this species were studied in northern Argentinean coastal waters, where specimens arrive seasonally (winter-spring). Sexual dimorphism in maximum precaudal length (PCL) and total body mass (TM) was found, being females (PCL=630 mm; TM=3330 g; n=167) larger and heavier than males (PCL=482 mm; TM=1630 g; n=19). Maturity size for females was 466.22 mm PCL, representing 74% PCL of the largest female sampled. The mean number of ovarian follicles was 8.37 (± 4.84). The highest values of ovarian follicles diameter, gonadosomatic and oviducalsomatic indices...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Holocephalans; Maturity; Ovarian fecundity; Seasonality; South-western Atlantic.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200203
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Feeding association between benthic and nektonic Neotropical stream fishes Neotropical Ichthyology
Teresa,Fabrício Barreto; Carvalho,Fernando Rogério.
Following behaviour among Neotropical stream fishes have been scarcely reported. This type of feeding association was observed in a small stream in the upper rio Paraná system between the catfish, Aspidoras fuscoguttatus, acting as a nuclear species, and Knodus moenkhausii, Poecilia reticulata, and Astyanax altiparanae as follower species. Aspidoras fuscoguttatus individuals dug in the bottom during feeding, causing sediment suspension. Their followers picked food items in the "cloud" of suspended particles. Food items of sediment are no longer consumed by the catfish when in suspension, but are still available for K. moenkhausii, P. reticulata and A. altiparanae. Following behaviour is an alternative feeding tactic for these species, which reinforces the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aspidoras fuscoguttatus; Feeding strategies; Interspecific interaction; Following behaviour; Southeastern Brazil.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100013
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Kidney anatomy, histology and histometric traits associated to renosomatic index in Gymnotus inaequilabiatus (Gymnotiformes: Gymnotidae) Neotropical Ichthyology
Fernandes,Carlos Eurico; Marcondes,Sandrieley Fernanda; Galindo,Gizela Melina; Franco-Belussi,Lilian.
ABSTRACT The Gymnotus inaequilabiatus is a Neotropical fish widely distributed in marginal areas of bays. The aim of this study was to describe the main histological and histopathological traits in the head and exocrine kidney. Here, histometric and structural density techniques were associated with renosomatic index (RSI). The kidney was processed for light microscopy. Lipofuscin and hemosiderin content were visually estimated in the melonomacrophages centers (MMCs). All the biometric body variables were correlated with RSI, especially the kidney weight and gross lesions count. The general architecture of head and exocrine kidney was similar to that described for other teleost species. MMCs were prevalent in both portions and correlated with RSI in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish; Pathology; Renal morphology; Stereology; Teleost.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500207
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Intertidal life: field observations on the clingfish Gobiesox barbatulus in southeastern Brazil Neotropical Ichthyology
Pires,Tiago H. S; Gibran,Fernando Z.
The clingfish Gobiesox barbatulus shows nocturnal feeding activity, spending most part of the day stationary and adhered to the inferior part of stones. To feed, this species uses the sit-and-wait and particulate feeding tactics. It shows a carnivorous feeding habit mostly consuming small benthic crustaceans. It can move in two ways: (1) "stone-by-stone", sliding its ventral sucker disc across each stone and (2) "surf", when it takes advantage of the energy of the ebbing tide to quickly cross a distance up to four times its body length. Its reproductive season occurs between the end of spring and the beginning of summer, during which time it lays about 2,000 adhesive eggs of 1 mm each in a single layer under stones. It has more than one egg-laying session...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activity; Microhabitat; Diet; Reproduction; Gobiesocidae.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100022
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Evidence of polygamy in the socially monogamous Amazonian fish Arapaima gigas (Schinz, 1822) (Osteoglossiformes, Arapaimidae) Neotropical Ichthyology
Farias,Izeni Pires; Leão,Adam; Almeida,Yane Santos; Verba,Júlia Tovar; Crossa M.,Marcelo; Honczaryk,Alexandre; Hrbek,Tomas.
Arapaima gigas is one of the largest freshwater fishes of the world. It is socially monogamous, forming pairs, constructing a nest and providing parental care. We performed a paternity analysis under three scenarios in captive, semi-natural and natural areas using 10 microsatellite markers. As a positive control, we analyzed three pairs and their offspring isolated individually in artificial breeding ponds (a priori very high probability of monogamy). We then analyzed two samples of offspring from large artificial ponds with multiple adults but only one reproductive pair (a priori high probability of monogamy), two samples from semi-natural breeding station with multiple adults but only one reproductive pair (a priori high probability of monogamy), and a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mate choice; Microsatellites; Multiple paternity; Pirarucu; Polygamy.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000100195
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Three new species of the armored catfish genus Loricaria (Siluriformes: Loricariidae) from river channels of the Amazon basin Neotropical Ichthyology
Thomas,Matthew R.; Py-Daniel,Lúcia H. Rapp.
Three new species of Loricaria are described from large white- and black-water river channels of the Amazon basin of Brazil, the upper rio Negro drainage of southern Venezuela, and clear waters of the lower rio Tocantins. Loricaria spinulifera and L. pumila differ from other species of Loricaria by having unique patterns of abdominal plate development and hypertrophied odontodes forming conspicuous crests on dorsal surfaces of the head and predorsal plates. Both are small species of Loricaria, reaching sexual maturity at less than 120 mm SL, and exhibiting sexually dimorphic characters consistent with members of the L. cataphracta complex. Loricaria spinulifera differs from L. pumila in having a unique arrangement of buccal papillae and large thorn-like...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropical; Taxonomy; Loricariinae; Calhamazon; Rio Negro.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000300011
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Record of cleaning behavior by Platydoras costatus (Siluriformes: Doradidae) in the Amazon Basin, Brazil Neotropical Ichthyology
Carvalho,Lucélia Nobre; Arruda,Rafael; Zuanon,Jansen.
Records of cleaning symbiosis between freshwater fish are scarce. Here we report on juvenile catfish, Platydoras costatus, cleaning the piscivorous characin Hoplias cf. malabaricus in a stream of the rio Araguaia drainage in the Brazilian Amazon. The scarcity of records on cleaning behavior in freshwater systems seems to be in part a consequence of the few observational studies under natural conditions in the Neotropics. Otherwise, the rareness of this behavior in freshwaters is possibly related to the short evolutionary time available to the fish fauna to develop these complex interactions, when compared to the ocean environment.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Erythrinidae; Hoplias cf. malabaricus; Piscivorous client; Juvenile cleaner; Rio Araguaia.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200009
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Reproductive behavior, development and eye regression in the cave armored catfish, Ancistrus cryptophthalmus Reis, 1987 (Siluriformes: Loricariidae), breed in laboratory Neotropical Ichthyology
Secutti,Sandro; Trajano,Eleonora.
The troglobitic armored catfish, Ancistrus cryptophthalmus (Loricariidae, Ancistrinae) is known from four caves in the São Domingos karst area, upper rio Tocantins basin, Central Brazil. These populations differ in general body shape and degree of reduction of eyes and of pigmentation. The small Passa Três population (around 1,000 individuals) presents the most reduced eyes, which are not externally visible in adults. A small group of Passa Três catfish, one male and three females, reproduced spontaneously thrice in laboratory, at the end of summertime in 2000, 2003 and 2004. Herein we describe the reproductive behavior during the 2003 event, as well as the early development of the 2003 and 2004 offsprings, with focus on body growth and ontogenetic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Troglobitic catfish; Brazilian caves; Regressive evolution; Reproduction; Goiás State.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300016
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A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Araguaia basin, Brazil, with comments about Corydoras araguaiaensis Sands, 1990 Neotropical Ichthyology
Tencatt,Luiz Fernando Caserta; Britto,Marcelo Ribeiro de.
ABSTRACT A new species of Corydoras is described from the rio Araguaia basin, Goiás, Brazil. The new species can be distinguished from its congeners by presenting the following features: infraorbital 1 with very large ventral laminar expansion; infraorbital 2 contacting compound pterotic; flanks densely covered by irregular black spots; and ventral surface of trunk densely covered by coalescent relatively well-developed platelets. It is also discussed the possibility that C. araguaiaensis comprehends a complex of species.
Tipo: Info:eu-repo/semantics/article Palavras-chave: C65; Corydoradinae; Corydoras sp. "Guaraná"; Goiás State; Taxonomy.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100201
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Scoloplax baskini: a new spiny dwarf catfish from rio Aripuanã, Amazonas, Brazil (Loricarioidei: Scoloplacidae) Neotropical Ichthyology
Rocha,Marcelo Salles; Oliveira,Renildo Ribeiro de; Py-Daniel,Lúcia H. Rapp.
A new species of Scoloplax is described from small tributaries of rio Aripuanã, rio Madeira drainage, Amazonas State, Brazil. The new species can be distinguished from its congeners by several morphological features, such as ventral midline plates with two longitudinal parallel rows of odontodes not covered by skin, pectoral and pelvic fins with all rays simple, unbranched, and mesethmoid with a thickened triangular anterior process. Implications of new records of S. dolicholophia from rio Japurá and other comparative features within the genus are discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Taxonomy; Neotropical; Systematics; Siluriformes.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000300005
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Sexual development and reproductive pattern of the Mutton hamlet, Alphestes afer (Teleostei: Epinephelidae): a dyandric, hermaphroditic reef fish Neotropical Ichthyology
Marques,Simone; Ferreira,Beatrice Padovani.
There is little knowledge on the reproduction of the genus Alphestes. The reproduction of the Mutton hamlet, Alphestes afer, sampled in Pernambuco reefs (Brazil) was studied based on macroscopic analysis during reproductive period and histological analysis of gonad material from March 2008 to October 2009. This study showed that A. afer is a diandric, protogynous hermaphrodite. Sex change followed protogynous mode in two pathways: primary males formed from immature female individuals or secondary males formed from resting, ripe or spent female individuals. The numerical distribution of gonad classes by size indicated that females from 11-18 cm L T were immature while females from 16-25 cm L T and males from 12-22 cm L T were in various stages of gonadal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Juvenile sex change; Protogynous hermaphrodite; Reproduction.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300008
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A new cave species of Rhamdia (Siluriformes: Heptapteridae) from Serra do Ramalho, northeastern Brazil, with notes on ecology and behavior Neotropical Ichthyology
Bichuette,Maria Elina; Trajano,Eleonora.
Rhamdia enfurnada, a new troglobitic (exclusively subterranean) catfish, is described from the Gruna do Enfurnado, Serra do Ramalho, southwestern Bahia State, middle São Francisco River basin. It differs from epigean congeners from the São Francisco River basin by the variable eye size, ranging from reduced to externally invisible (bilateral asymmetry in development of eyes is frequently observed), with a conspicuous orbital concavity (orbital diameter varying from 6.4 to 13.6% of head length in R. enfurnada and from 14.5 to 24.4% in the epigean species); by the dark pigmentation reduced due to a decrease in density of melanophores, and also variable. In comparison to other cave species, R. enfurnada presents a low degree of troglomorphism regarding...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Subterranean catfishes; Rhamdia enfurnada; Bahia; São Francisco River basin; Taxonomy.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000400016
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