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Registros recuperados: 8
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A new species of Bryconamericus (Characidae: Stevardiinae: Diapomini) from the upper rio Paraná basin, Brazil Neotropical Ichthyology
Jerep,Fernando C.; Shibatta,Oscar A..
ABSTRACT Bryconamericus is the most diverse genus within Stevardiinae, comprising 61 valid species distributed in Cis- and Trans-Andean basins from Panama in Central America to northern Argentina in South America. Three species are known from the upper rio Paraná basin: B. exodon, B. iheringii, and B. turiuba. Herein we describe a new species of Bryconamericus from the upper rio Paraná basin inhabiting tributaries of Ivaí, Piquiri, and Tibagi basins, Paraná State, Brazil. The new species differs from its congeners by the presence of unaligned teeth in the outer tooth row of the premaxilla; a single, vertical, dorsally expanded and rounded humeral spot; 36-39 pored scales in the longitudinal series; body depth 31.6-37.9% SL; anal-fin base length 24.8-30.1%...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Actinopterygii; Characiformes; Geometric Morphometrics; PCA; Taxonomy.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000300207
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Chromosome evolution in fishes: a new challenging proposal from Neotropical species Neotropical Ichthyology
Nirchio,Mauro; Rossi,Anna Rita; Foresti,Fausto; Oliveira,Claudio.
We present a database containing cytogenetic data of Neotropical actinopterygian fishes from Venezuela obtained in a single laboratory for the first time. The results of this study include 103 species belonging to 74 genera assigned to 45 families and 17 out of the 40 teleost orders. In the group of marine fishes, the modal diploid number was 2n=48 represented in 60% of the studied species, while in the freshwater fish group the modal diploid complement was 2n=54, represented in 21.21 % of the studied species. The average number of chromosomes and the mean FN were statistically higher in freshwater fish than in marine fish. The degree of diversification and karyotype variation was also higher in freshwater fish in contrast to a more conserved cytogenetic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Actinopterygii; Ancestral karyotype; Diploid number; Fundamental number.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000400761
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Hemiodus langeanii (Characiformes: Hemiodontidae), a new species from rio Amana, rio Maués-Açú drainage, Amazon basin, Brazil Neotropical Ichthyology
Beltrão,Hélio; Zuanon,Jansen.
Hemiodus langeanii, new species, is described based on 20 specimens collected in the rio Amana, a tributary of rio Maués-Açú, rio Amazonas drainage, Brazil. The new taxon can be distinguished from its congeners by its high body (27.1-35.3%, average 32.3% SL vs. 18.8-28.5% in remaining species). The new species also exhibits a large lateral dark spot that is equal to, or greater than, the eye diameter (vs. smaller in remaining species except for H. microlepis). The lack of conspicuous lateral stripe or transverse bands and the low lateral line scales count (68-74) distinguish H. langeanii from some similar species in the genus (scale counts: 94-123 in H. argenteus, 124-148 in H. microlepis, 86-99 in H. orthonops and 77-92 in H . parnaguae). Finally, the new...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Actinopterygii; Anthropogenic disturbance; Goldmining; Hemiodus unimaculatus; Ostariophysi.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200004
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Preferential accumulation of sex and Bs chromosomes in biarmed karyotypes by meiotic drive and rates of chromosomal changes in fishes Anais da ABC (AABC)
MOLINA,WAGNER F.; MARTINEZ,PABLO A.; BERTOLLO,LUIZ A.C.; BIDAU,CLAUDIO J..
Mechanisms of accumulation based on typical centromeric drive or of chromosomes carrying pericentric inversions are adjusted to the general karyotype differentiation in the principal Actinopterygii orders. Here, we show that meiotic drive in fish is also supported by preferential establishment of sex chromosome systems and B chromosomes in orders with predominantly bi-brachial chromosomes. The mosaic of trends acting at an infra-familiar level in fish could be explained as the interaction of the directional process of meiotic drive as background, modulated on a smaller scale by adaptive factors or specific karyotypic properties of each group, as proposed for the orthoselection model.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Actinopterygii; B chromosomes; Centromeric drive; Chromosome evolution; Sex chromosomes.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401801
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Ray-finned fishes (Osteichthyes, Actinopterygii) from the type Maastrichtian, the Netherlands and Belgium Naturalis
Friedman, M..
Ray-finned fishes are a diverse, but understudied, component of the Maastrichtian marine fauna of the southeast Netherlands (Limburg) and northeast Belgium (Liège-Limburg). The most extensive reviews of fishes from these uppermost Cretaceous deposits were made in the early and mid-Twentieth Century, but little research on this important assemblage has been executed since. The present paper provides figures and brief descriptions of fishes from the Maastrichtian type area as an aid for field identification of fossil discoveries. A simple key to common Maastrichtian fish teeth from this area is also included. All convincing records of ray-finned fishes from the Maastrichtian of the Netherlands and Belgium, inclusive of the Mons Basin, are teleosts, and...
Tipo: Article / Letter to the editor Palavras-chave: Osteichthyes; Actinopterygii; Teleostei; Bony fish; Cretaceous; Maastrichtian; Type area; Europe; K/Pg extinction; 42.81.
Ano: 2012 URL: http://www.repository.naturalis.nl/record/428932
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Registro de Atherinella blackburni (Schultz) (Actinopterygii, Teleostei, Atherinopsidae) na praia de Ponta da Ilha, Ilha de Itaparica, Bahia, Brasil Zoologia
Lopes,Paulo Roberto Duarte; Oliveira-Silva,Jailza Tavares de.
Atherinella blackburni (Schultz, 1949) (Atherinopsidae), is known in the Atlantic Ocean in Costa Rica, south of Caribe and from Venezuela to central Brazil. The distribution and the intraespecific variation of characters of A. blackburni are poorly known. This study records A. blackburni in Bahia littoral and presents more informations about its intraespecific variation.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Actinopterygii; Teleostei; Atherinopsidae; Atherinella blackburni; Record; Bahia; Brazil.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000100012
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Relação preliminar das espécies de peixes (Pisces, Elasmobranchii, Actinopterygii) ameaçadas no Brasil Zoologia
Rosa,Ricardo S; Menezes,Naércio A.
The Brazilian fish fauna is still poorly known with respect to its diversity and conservation status, particularly of freshwater species. Human activities and population growth are rapidly impacting this fauna to an unchecked extent, so that many fish species are presently threatened. Also, some areas have been so critically altered that their fish fauna can no longer be properly inventoried. There is an urgent need to evaluate the conservation status of Brazilian fish species, since none are presently listed as endangered by federal legislation. Based on a literature search and a survey directed to the Neotropical ichthyologists, we present an unofficial list including a total of 78 threatened fish species (12 elasmobranchs and 66 actinopterygians). Of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pisces; Elasmobranchii; Actinopterygii; Endangered species; Conservation; Brazil.
Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751996000300015
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The clavobranchialis musculature in sarcopterygian fishes, and contribution to osteichthyan feeding and respiration Naturalis
Johanson, Zerina.
Various fossil lungfish taxa preserve distinct depressions on the smooth postbranchial lamina of the dermal pectoral girdle. These depressions are largely unknown in other sarcopterygian fishes, but are present in the rhizodont sarcopterygian Strepsodus. Comparisons with extant actinopterygian fishes suggest these depressions mark the point of origin for the clavobranchialis musculature, extending anterodorsally into the gill chamber to insert on the ventral surface of the ceratobranchial(s). Studios examining feeding and respiratory mechanisms of bony fishes (Osteichthyes) have emphasised the role of mandibular depression in generating negative pressures within the oral cavity to draw in water/air/food via suction. However, phylogenetically basal...
Tipo: Article / Letter to the editor Palavras-chave: Clavobranchiales; Sarcopterygii; Actinopterygii; Chondrichthyes; Coracobranchiales; Dipnoi.
Ano: 2003 URL: http://www.repository.naturalis.nl/record/534410
Registros recuperados: 8
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