É apresentada uma síntese sobre os peixes do Alto Paraná, com base em dados de coleções, literatura e novas coletas. Trezentas dez espécies, 11 ordens 38 famílias, são referidas para a drenagem, aumentando significativamente números anteriores. Dentre as espécies da área, 236 (76,1%) autóctones, 67 (21,6%) alóctones sete (2,3%) exóticas. As principais causas ocorrência não nativas (alóctones exóticas) foram dispersão partir baixo após construção Reservatório Itaipu o escape pisciculturas. A...

ABSTRACT The species Rhamdia branneri Haseman, 1911 and the subspecies voulezi from rio Iguaçu are currently recognized as synonyms of quelen (Quoy & Gaimard, 1824). However, recent karyotype ecomorphology studies distinguish R. different species. Examination populations Iguaçu, including type specimens, together with other congeners Tibagi, allowed to properly reexamine situation these Haseman's taxa references given in Iguaçu. have strong serrae large basis on both margins pectoral-fin...

A new species, Batrochoglanis castaneus, is described from the Aripuanã River basin, Brazil. It differs congeners, except B. raninus and transmontanus, by dark brown color of body a stripe on caudal fin. The species longer maxillary barbel, prepelvic length, greater prepectoral smaller anal-fin base head depth. transmontanus caudal-fin dorsal lobe, presence hyaline spot or pelvic, dorsal, anal fins, pectoral-fin, dorsal-fin spines, eye diameter, depth, larger mouth width. metapterygoid...

A new species of Microglanis is described from the upper rio Tocantins basin, Barro Alto, Goiás State, Brazil. This distinguished others by presenting a unique color pattern, consisting round spots in flank between larger dark brown blotches. Moreover, it can be combination following features: caudal fin emarginate, lobe slightly than lower, lateral line relatively long, reaching vertical through posterior margin pelvic fin, and light stripe on supra-occipital region absent or very narrow...

Four populations of Astyanax aff. fasciatus the upper rio Tibagi (municipal district Ponta Grossa, Paraná State, Brazil), had their karyotypes and morphometry analyzed. The cytogenetic data show occurrence distinct (cytotypes), here named cytotype A, with 2n=48 chromosomes (6m+18sm+14st+10a), B, 2n=50 (8m+18sm+14st+10a) C, (8m+18sm+14st+10a). distribution pattern constitutive heterochromatin was very similar between cytotypes A but diverged in relation to C. Distinct may occur sympatry...

ABSTRACT Rhyacoglanis, a new genus of the South American freshwater catfish family Pseudopimelodidae is described from cis-Andean portions continent. Rhyacoglanis distinguished other genera by three synapomorphies: presence light blotch on cheek; connection between middle dark caudal-fin stripe and caudal-peduncle pigmentation; 30-35 total vertebrae. Species are rheophilic strongly associated with rapids swift-flowing waters. A phylogenetic analysis based 41 morphological characters yields...

Hoplias malabaricus, the common trahira, extended its range into Iguaçu River sometime in last decades. To determine levels of genetic differentiation neighboring basins this nominal taxon, as well to unveil source invading population, we analyzed patterns similarity RAPD-PCR genomic markers samples from Paraná, and Tibagi Rivers. The high diversity Paraná Rivers suggested strong population structuring or even occurrence undescribed species. All alleles sample headwaters were present River,...

As espécies foram coletadas em quatro trechos ao longo de um gradiente formado pelo reservatório UHE Escola Engenharia Mackenzie (Capivara). A diversidade foi analisada pela constância, índice Shannon-Wiener e similaridade da composição entre através do coeficiente Jaccard. O tem uma riqueza peixes composta por 67 incluídas 5 ordens; 47% das são constantes, 15 % acessórias 28% acidentais. Os maiores índices Jaccard obtidos Cinzas Tibagi, que os mais distantes barragem apresentam grandes...

Com o objetivo de se avaliar a qualidade do ambiente e os padrões diversidade das espécies peixes um riacho urbano alterado, foram feitas avaliações da hábitats, análises velocidade água levantamento distribuição peixes. Para abranger uma quantidade maior ambientes, cinco trechos ao longo ribeirão escolhidos para quatro coletas sazonais ictiofauna, em função suas diferentes características físicas influência ação humana. Um total 5.426 espécimes, 12 6 ordens, foi coletado. Através análise...

Iheringichthys labrosus is a catfish from the Paraná River basin with peculiar conical snout, small mouth, thin premaxillary dentigerous plate, and broad upper lip folded posteriorly, differing other genera of Pimelodidae except for monotypic Bergiaria. This comprehensive study on cleared stained specimens dry skeletons demonstrates many similarities Pimelodus maculatus, showing conservative skeleton differences only in shape buccal apparatus bones. Bergiaria westermanni diverges I. by...

ABSTRACT The cephalic musculature of the Pacman catfish Lophiosilurus alexandri ( L. ) is described and compared with Pimelodus maculatus, microstoma , Pseudopimelodus mangurus P. ), Batrochoglanis labrosus B. fowleri ). Besides distinguished head shape, which strongly depressed, broad, a large mouth, we hypothesize that gross morphology related to phylogenetic background. A analysis selected characters evidenced three putative synapomorphies for family Pseudopimelodidae, subfamily...

The gross morphology of the brain pseudopimelodid Pseudopimelodus bufonius is described and compared with congeners. Observations were made on removed brains after elimination bones from top skull severing cranial nerves spinal cord. Nine morphometric characters associated major subdivisions identified, seven which revealed significant differences among species examined. corpus cerebelli in all examined genus largest structure brain. behavior still unknown, but other teleosts that condition...

Plagioscion squamosissimus (Heckel, 1840) foi estudada em cinco trechos de influência da represa Capivara nos rios Paranapanema e Tibagi. As amostragens foram realizadas dois períodos, 1992/1993 1994/1995, coletas mensais, sazonalmente no período 2001/2002. capturas efetivadas com redes espera simples malhas entre 2 a 12 cm. Foram analisados 993 exemplares. Os itens alimentares identificados agrupados categorias pelo método composição percentual. A dieta comparada os períodos trechos, pela...

Gymnogeophagus setequedas is a rare and rheophilic species of tribe Geophagini, considered endangered in Brazilian red lists. Its previously known geographical distribution range was the Paraná River basin, Paraguay, tributary Itaipu Reservoir Brazil. Since its description no specimens have been collected original area. However, recent records G. lower Iguaçu River, region highly endemic for ichthyofauna, extended may represent one last remnants species. The aim this study to estimate...

Environmental heterogeneity is a factor which can help explain the higher local species richness. The objective of this study was to test if richness and composition anurans are related available microhabitats landscape type sampled sites. We assume that number increase environmental this, in turn, affects amphibians. performed Mesophytic Semideciduous Forest, vegetation within Atlantic Forest Domain. Between October 2010 February 2011, we 23 water bodies located agricultural, forest, urban...

A ictiofauna de quatro trechos da bacia hidrográfica do rio Tibagi foi amostrada mensalmente maio 2001 a abril 2002, com redes espera (totalizando 1.000 m²) para analisar dominância, constância e similaridade. Um total 68 espécies (32 Characiformes, 32 Siluriformes, 2 Gymnotiformes Perciformes) 2.758 exemplares foram capturados. O trecho maior riqueza abaixo (50 espécies), seguido por acima (40 Iapó (35) Fortaleza (14). No ocorreu o menor número espécies, mas verificada abundância, 508 dos...

Abstract The gross morphology of the gas bladder is described and compared for representatives all valid genera Pseudopimelodidae (Siluriformes). Cephalosilurus albomarginatus species Batrochoglanis , Microglanis have most basic form: a large, cordiform with simple internal T‐shaped septum. apurensis C. fowleri, nigricauda also bladder, but they well‐developed trabeculae associated septum, pair constrictor muscles inserted on external wall; latter feature present in Pimelodidae, absent other...

The Neotropical catfish family Pseudopimelodidae includes seven genera and 50 valid species, widely distributed in South America. To address the lack of comparative information on siluriform brains, gross morphology major brain subdivisions is described, illustrated interpreted. A comprehensive comparison based shape, relative size position main presented for representative species all family. Comparisons with other phylogenetically related families, Pimelodidae Heptapteridae, non-related...

Neotropical catfishes of the family Pseudopimelodidae comprise 53 species allocated to seven genera widely distributed in South America from northwestern Colombia and Venezuela Argentina Uruguay. Intergeneric relationships based on morphology-based phylogenies are conflicting, interspecific remain incipient. We conducted first molecular phylogeny by analyzing sequence data ultraconserved elements (UCEs) genome for 33 specimens 19 related taxa. Phylogenetic were accessed concatenated matrices...