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| Registros recuperados: 13 | |
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| Wosiacki,Wolmar B.; Pinna,Mário de. |
| A new species of Trichomycterus is described for the rio Iguaçu drainage in Southern Brazil. Trichomycterus igobi, new species, is readily distinguishable from all other species currently in the genus by its extremely large head (23.8-26.8 % SL), which is proportionally the largest head in any Trichomycteridae. That characteristic plus the relatively deep body result in a very short-bodied overall aspect, the most extremely such case in the genus Trichomycterus. Other diagnostic features that distinguish the new species from most or all of its congeners include a short caudal peduncle (15.4-19.7 % SL); an almost entirely cartilaginous second hypobranchial (with only vestigial ossification); a mesial expanded palatine ossification; a narrow cleithrum,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Systematics; Taxonomy; Fishes; Trichomycterinae; Paraná Basin. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100003 |
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| Gaugris,Kariny De Amorim; Grahn,Yngve. |
| Devonian chitinozoans from two wells in the north-northwestern outcrop belt of the Paraná Basin, and three in the eastern outcrop belt of the same basin, have been investigated for this study. A new, hitherto undescribed chitinozoan assemblage of Early Devonian, pre-late Emsian age is recognized above the Ramochitina magnifica Lange interval range Zone, in addition to new species from younger Devonian beds. A new Early Devonian biozone, the Ancyrochitina pachycerata interval range Zone, is erected. Altogether, 16 new species are described of which 10 are left in open nomenclature due to insufficient number of well-preserved specimens. The biostratigraphy of the new chitinozoan species is compared with the chitinozoa and miospore zones previously recognized... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Devonian; Chitinozoa; Paraná Basin; Brazil. |
| Ano: 2006 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000200004 |
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| CARDOSO,YAMILA P.; BRANCOLINI,FLORENCIA; PROTOGINO,LUCILA; PARACAMPO,ARIEL; BOGAN,SERGIO; POSADAS,PAULA; MONTOYA-BURGOS,JUAN I.. |
| Abstract Abstract: Hypostomus commersoni Valenciennes 1836, Hypostomus cordovae (Günther 1880) and Hypostomus laplatae (Eigenmann 1907) have been little studied since their original descriptions. This study shows a comprehensive review of these species from the Lower La Plata Basin, including their taxonomic history, distribution, color patterns, morphology, and ecological and molecular phylogenetic data. Morphological and phylogenetic analyses based on D-loop sequences suggested that H. commersoni can be separated into two subclades, or subgroups. Based on these results and on the non-overlapping distribution range of the two subclades, we conclude that they represent two distinct species, thereby revalidating H. spiniger. The results also suggest that H.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Brazil; Freshwater fishes; Molecular phylogenetics; Paraná Basin. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300604 |
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| Pires,Etiene F.; Guerra-Sommer,Margot. |
| The anatoical description of silici?ed Gymnospermae woods from Upper Triassic sequences of southernmost Paraná Basin (Brazil) has allowed the identi?cation of a new taxon: Sommerxylon spiralosus n.gen. et n.sp. Diagnostic parameters, such as heterocellular medulla composed of parenchymatous and sclerenchymatous cells, primary xylem endarch, secondary xylem with dominant uniseriate bordered pits, spiral thickenings in the radial walls of tracheids, medullar rays homocellular, absence of resiniferous canals and axial parenchyma, indicate its relationship with the family Taxaceae, reporting on the first recognition of this group in the Triassic on Southern Pangea. This evidence supports the hypothesis that the Taxaceae at the Mesozoic were not con?ned to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fossil wood; Taxacean affinity; Upper Triassic; Paraná Basin. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300013 |
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| RICARDI-BRANCO,FRESIA; ARAI,MITSURU; RÖSLER,OSCAR. |
| This paper presents the results of a detailed study of megaspores occurring in coal seams of the Triunfo Member, Rio Bonito Formation at Figueira, Paraná State, Brazil. This coal-bearing sequence accumulated in a marine delta system during the Early Permian. Four species are described and illustrated: Lagenoisporites triunfensis, L. scutiformis, Sublagenicula cf. brasiliensis, and Setosisporites cf. furcatus. Of these, the two species of Lagenoisporites are predominant. Relationships to other megaspore species are discussed; and the temporal and spatial distributions of the four species in the Paraná Basin are documented. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Megaspores; Permian; Rio Bonito Formation; Paraná Basin. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300011 |
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| NOWATZKI,CARLOS H.; KERN,HENRIQUE P.. |
| This paper discusses the facies distribution of Mesozoic eolian sandstones between the Sanga do Cabral and Botucatu formations and also their contact relationships, in São Leopoldo area, State of Rio Grande do Sul (RS), southern Brazil. The main distinctive characteristics regarding these sandstones and formations are the mineralogical composition, paleocurrents and the occurrence of wet interdune deposits. These interdune deposits are characterized by frequent thin mudstone layers with mudcracks, ichnofossils and salt impressions. There are also some features that resemble plant fossils. The distinctive characteristics of these sequences to Sanga do Cabral and Botucatu formations allow us to suggest the informal name of Pedreira Sandstone, considering its... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stratigraphy; Paraná Basin; Mesozoic; Faciology; Paleoenvironments. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200010 |
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| Salvi,Juliana; Jasper,André; Ricardi-Branco,Fresia; Bernardes-de-Oliveira,Mary Elizabeth C.; Guerra-Sommer,Margot. |
| The genus Lycopodites, which encompasses the herbaceous forms of the lycopsids, presents broad time and spacial distribution during the Paleozoic in the Northern Hemisphere, with its initial records dating from the European Devonian. As to Gondwanan Paleozoic, to this moment, only Lycopodites amazonica Dolianiti had been reported for the Amazonian Middle Devonian (Curuá Group). Thus, the specimens reported in this study such as Lycopodites sp., coming from sedimentary rocks of the Itararé Subgroup, São Paulo State, and Lycopodites riograndensis sp. nov., collected in Rio Bonito Formation, Rio Grande do Sul, represent the oldest fertile forms recorded for Gondwana and the first ones to be described for the Paraná Basin. Its presence in layers, deposited... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lycopodites sp.; Lycopodites riograndensis sp. nov.; Gondwana; Lower Permian; Paraná Basin. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300015 |
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| Súarez,Yzel Rondon; Valério,Sabrina Bigatão; Tondado,Karina Keyla; Florentino,Alexandro Cezar; Felipe,Thiago Rota Alves; Ximenes,Lidiani Queli Lubas; Lourenço,Luzia da Silva. |
| The influence of spatial, temporal and environmental factors on fish species diversity in headwater streams in Paraguay and Paraná basins, Brazil was examined. A total of 4,605 individuals were sampled, distributed in 60 species. The sampled streams in Paraná basin presented a larger total species richness (42) than Paraguay streams (40). However the estimated richness was larger in Paraguay basin (53) than Paraná streams (50). The streams of Paraná basin had a greater mean species richness and evenness, while more individuals per sample were found in the Paraguay basin. Difference between the sub-basins were found in the Paraguay basin, while for the basin of Paraná, richness and evenness vary significantly between the sub-basins, but the number of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community ecology; Fish diversity; Streams; Paraguay Basin; Paraná Basin. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000700014 |
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| Registros recuperados: 13 | |
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