Reavaliação taxonômica dos gêneros Gangamopteris e Rubidgea, Permiano Inferior da bacia do Paraná, Brasil

Tybusch, Graciela Pereira; Iannuzzi, Roberto

doi:10.4072/rbp.2008.2.01

Cited by 19 publications

(19 citation statements)

References 15 publications

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“…Some other specimens from the Early Permian strata of the Paraná Basin, southeast-southern Brazil, also showed same diagnostic characters, e.g., a straight venation pattern of the middle portion of a leaf with razor shape generated by winding of its lamina ( Figure 5). Amongst the specimens identified by Tybusch and Iannuzzi (2008), such as Gangamopteris buriadica Feistm in deposits of the Rio Grande do Sul State (Quitéria and Acampamento Velho outcrops); only very few (listed above) can be kept within this fossil-species in view of the new diagnostic characters added here. Therefore, the remaining specimens described by Tybusch and Iannuzzi (2008) would be reassigned into another taxon to be defined.…”

Section: Discussionmentioning

confidence: 96%

“…Amongst the specimens identified by Tybusch and Iannuzzi (2008), such as Gangamopteris buriadica Feistm in deposits of the Rio Grande do Sul State (Quitéria and Acampamento Velho outcrops); only very few (listed above) can be kept within this fossil-species in view of the new diagnostic characters added here. Therefore, the remaining specimens described by Tybusch and Iannuzzi (2008) would be reassigned into another taxon to be defined. Furthermore, the specimens (listed above) recovered from the São Paulo State (Itapema Sítio outcrop, in Cerquilho municipality) and used by Millan and Dolianiti (1982) to erect the species Rubidgea itapemensis were recently reassigned by Tybusch (2013) and Hoelzel (2014) to Gangamopteris buriadica Feistm.…”

Section: Discussionmentioning

confidence: 96%

“…Iannuzzi, Bernardes-de-Oliveira, Pillai differs from all others species of the genus by having curled lamina (synthesis of Gangamopteris species in Maithy, 1966;Pant and Singh, 1968;McLoughlin, 1990McLoughlin, , 1994aMcLoughlin, , 1994b, except for the species G. revoluta Tybusch et Iannuzzi, 2008 from the Early Permian deposits, e.g. the upper portion of Itararé Group and Rio Bonito Formation of the Rio Grande do Sul State, in Paraná Basin (Tybusch and Iannuzzi, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…One way to test this hypothesis, if no leaf has been found in organic connection, as in this case, could be made through the recurrent record of this same leaf form having always the lamina curled in different sites /geographic areas and / or stratigraphic horizons. Because of this, the occurrence of this feature in Indian and similar Brazilian specimens, according to descriptions by Tybusch and Iannuzzi (2008), Tybusch (2013), andHoelzel (2014), is a very important and significant fact for considering the curled lamina as a valid diagnostic character. This same argument was used by Tybusch and Iannuzzi (2008) to justify the inclusion of the curling trait as a diagnostic feature of the Brazilian species G. revoluta.…”

Section: Final Remarksmentioning

confidence: 96%

“…Additionally, other specimens from the São Paulo (southeastern Brazil) and Rio Grande do Sul states (southern Brazil), described by Millan and Dolianiti (1982), Tybusch and Iannuzzi (2008), Tybusch (2013) and Hoelzel (2014) were examined and compared. Therefore, the main goal of this study is to reevaluate this species diagnostic characters based on the type material housed at the collection of the Geological Survey of India (under prefix GSI), Calcutta, India, and other specimens housed at the collections of the Department of Geology and Paleontology (DGP) of the National Museum (MN Maithy.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Diagnose emendada de Gangamopteris buriadica Feistmantel do Permiano do Gondwana

Iannuzzi

Bernardes-de-Oliveira

Pillai³

et al. 2016

Geol. USP. Sér. Cient.

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This study aims mainly to revaluate the diagnostic characters of Gangamopteris (?) buriadica Feistmantel based on the analysis of the type material, housed at the collection of the Geological Survey of India, Calcutta, and other specimens, housed in distinct collections of southeastern (São Paulo, Rio de Janeiro) and southern Brazil (Porto Alegre). A recent reexamination of the type material revealed an unusual taphonomic feature which is characterized by the lateral folding of the leaf lamina under itself. This fact leads to a new interpretation of the leaf shape from a lanceolate-spathulate to a more ovate to obovate outline. Additionally, the partial view of the lamina hinders the observation of the true lateral veins pattern in their full extent, which inclines towards the lateral margins. As a consequence of this reinterpretation, we propose an amendment to the species original diagnosis, to include the curled lamina and lateral venation pattern of leaf margins as diagnostic characters of the species. Some specimens from the Early Permian strata of the Paraná Basin also show the same diagnostic characters and therefore have been included in this fossil-species. Consequently, the occurrence of G. buriadica Feistm. emend. is confirmed and extended to the Paraná Basin, being stratigraphically (e.g., Itararé Group and Rio Bonito Formation) and geographically (e.g., São Paulo and Rio Grande do Sul states) spread over southeast-southern Brazil. Finally, the taxonomic, taphonomic and ecological implications of the presence of curled leaves are briefly discussed.Keywords: Gangamopteris buriadica; Morphotaxonomy; Curled leaf; Indo-Brazilian Gondwana flora; Early Permian. ResumoO principal objetivo deste estudo é reavaliar os caracteres diagnósticos de Gangamopteris (?) buriadica Feistmantel com base na análise do material tipo, depositado na coleção do Serviço Geológico da Índia, Calcutá, e outros espécimes depositados em distintas coleções situadas no sudeste (São Paulo, Rio de Janeiro) e sul (Porto Alegre) do Brasil. Um recente reexame do material tipo revelou uma feição tafonômica única: a lâmina foliar está lateralmente dobrada sobre si mesma. Este fato implica em uma nova interpretação da forma da folha de um contorno lanceolado-espatulado para um mais ovalado-obovado. Além disso, a visão apenas parcial da lâmina não permite o entendimento do verdadeiro padrão das veias laterais por completo, as quais se inclinam em direção às margens laterais. Como uma conseqüência desta reinterpretação, propomos uma emenda à diagnose original desta espécie, a fim de incluir a lâmina curvada e o padrão de venação das margens laterais da folha como características diagnósticas da mesma. Alguns outros espécimes dos estratos permianos iniciais da Bacia do Paraná, também demonstraram essas mesmas feições diagnósticas e por isso foram incluídas nesta espécie fóssil. Conseqüentemente, a ocorrência de G. buriadica Feistm. emend. é confirmada e estendida para a Bacia do Paraná, sendo estratigráfica (Grupo Itararé e Formação Ri...

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Section: Discussionmentioning

confidence: 96%