Giovanne M. Cidade, D. Riff, Felipe Carreira da Silva, Y. M. Alves
The Late Cretaceous continental deposits of the Bauru Group of Brazil have a rich vertebrate fossil fauna, but studies on the fossil fishes from the unit are scarce. This paper describes new occurrences of the Vidalamiinae subfamily of the bony fish group Amiidae (Halecomorphi: Amiiformes). The new occurrences are comprised by three isolated vertebral centra and three isolated teeth from the Marília and Adamantina formations, which were collected in Uberaba and Prata municipalities. The fossils described here not only expand the record of Vidalamiinae for the Bauru Group, but also clarify that the assignment of isolated teeth to this group may now be done with more certainty, which was not the case in many previous studies. Additionally, we also refer the described specimens tentatively to the Vidalamiini, which is the first assignment to this group and to the tribe level for any fish material from the Bauru Group. This study also offers an overview on the paleobiogeography of the Amiidae during the Late Cretaceous and an updated compilation of vidalamiine records during the Cretaceous, with a special focus on the freshwater records of this originally saltwater group. Finally, we also discuss the distribution of the tribes Vidalamiini and Calamopleurini during the Late Cretaceous, and the possibility that the North American and South American vidalamiines may have dispersed between the continents through a land connection. Keywords: Amiiformes, Amiidae, Vidalamiinae, Bauru Group, Late Cretaceous, biogeography. RESUMO – Os depósitos continentais do Cretáceo Superior do Grupo Bauru do Brasil possuem uma rica fauna fóssil de vertebrados, mas os estudos sobre os peixes fósseis da unidade são escassos. Este artigo descreve novas ocorrências da subfamília Vidalamiinae do grupo de peixes ósseos Amiidae (Halecomorphi: Amiiformes). As novas ocorrências são compostas por três centros vertebrais e três dentes isolados das formações Marília e Adamantina, que foram coletados nos municípios de Uberaba e Prata. Os fósseis aqui descritos não apenas ampliam o registro de Vidalamiinae para o Grupo Bauru, mas também esclarecem que a atribuição de dentes isolados a este grupo pode agora ser feita com mais certeza, o que não era o caso em muitos estudos anteriores. Adicionalmente, também remetemos os espécimes descritos provisoriamente aos Vidalamiini, que é a primeira atribuição a este grupo e ao nível de tribo para qualquer registro de peixes do Grupo Bauru. Este estudo também oferece uma visão geral da paleobiogeografia dos Amiidae durante o Cretáceo Superior e uma compilação atualizada dos registros de vidalamiine durante o Cretáceo, com foco especial nos registros de água doce desse grupo originalmente de água salgada. Por fim, também discutimos a distribuição das tribos Vidalamiini e Calamopleurini durante o Cretáceo Superior e a possibilidade de que os vidalamiines norte-americanos e sul-americanos tenham se dispersado entre os continentes por meio de uma cone
巴西Bauru群晚白垩世陆相沉积有丰富的脊椎动物化石区系，但对该单元鱼类化石的研究较少。本文介绍了硬骨鱼亚科(无骨形目:无骨形目)中Vidalamiinae亚科的新发现。新出现的病例包括在乌贝巴和普拉塔市收集的Marília和Adamantina地层的三个分离的椎体中心和三个分离的牙齿。这里描述的化石不仅扩大了保鲁组的Vidalamiinae记录，而且还澄清了现在可以更确定地将孤立的牙齿分配给这一组，这在许多以前的研究中都不是这样。此外，我们还将所描述的标本暂定为Vidalamiini，这是第一次将该类群和来自Bauru类群的任何鱼类材料分配到部落水平。本研究还概述了晚白垩纪阿米达科的古生物地理学，并对白垩纪的维达拉米胺记录进行了更新汇编，特别关注了这一原咸水类群的淡水记录。最后，我们还讨论了晚白垩纪Vidalamiini和Calamopleurini部落的分布，以及北美和南美vidalamiines可能通过陆地连接分散在大陆之间的可能性。关键词:amiformes, Amiidae, Vidalamiinae, Bauru群，晚白垩世，生物地理resume - Os depósitos continentais do Cretáceo Superior do Grupo Bauru do Brasil possuem uma rica fauna fóssil de vertebrados, mas Os estudos sobre Os peixes fósseis da unidade s o escassos。Este artigo descreve novas ocorrências da subfamília Vidalamiinae do grupo de peixes ósseos Amiidae (Halecomorphi: amiformes)。As novas ocorrências spostas p1 três centrros vertebrais e três dentes isolados As formações Marília e Adamantina, que foram coletados no municípios de Uberaba e Prata。1 .下文描述了下列情况:1 . 海地通讯通讯系统;2 . 海地通讯通讯系统;3 . 海地通讯系统;3 .海地通讯系统;3 .海地通讯系统;3 .海地通讯系统;3 .海地通讯系统;3 .海地通讯系统;3 .海地通讯系统;在行政管理方面，tambassimimos和tambassimimos描述了对Vidalamiini的先决条件，以及对最初属性的定义，例如，对最初属性的定义，以及对最初属性的定义。埃斯特estudo tambem oferece乌玛visao; da paleobiogeografia dos弓鳍科杜兰特o Cretaceo优越e乌玛compilacao atualizada dos registros de vidalamiine杜兰特o Cretaceo com中心特别号registros德阿瓜公司desse grupo原德阿瓜salgada。鱼翅,tambem discutimos distribuicao das的斯巴达袍Vidalamiini e Calamopleurini杜兰特o Cretaceo优越e possibilidade de, os vidalamiines norte-americanos e sul-americanos tenham se dispersado之间os大陆穷meio de乌玛conexao terrestre。有:amiformes, Amiidae, Vidalamiinae, Grupo Bauru, Cretáceo Superior，生物地理学。
{"title":"New occurrences of Amiidae (Halecomorphi: Amiiformes: Vidalamiinae) from the Bauru Group (Late Cretaceous, Brazil) and comments about their incursion in freshwater environments in the Cretaceous of the Americas","authors":"Giovanne M. Cidade, D. Riff, Felipe Carreira da Silva, Y. M. Alves","doi":"10.4072/rbp.2022.2.04","DOIUrl":"https://doi.org/10.4072/rbp.2022.2.04","url":null,"abstract":"The Late Cretaceous continental deposits of the Bauru Group of Brazil have a rich vertebrate fossil fauna, but studies on the fossil fishes from the unit are scarce. This paper describes new occurrences of the Vidalamiinae subfamily of the bony fish group Amiidae (Halecomorphi: Amiiformes). The new occurrences are comprised by three isolated vertebral centra and three isolated teeth from the Marília and Adamantina formations, which were collected in Uberaba and Prata municipalities. The fossils described here not only expand the record of Vidalamiinae for the Bauru Group, but also clarify that the assignment of isolated teeth to this group may now be done with more certainty, which was not the case in many previous studies. Additionally, we also refer the described specimens tentatively to the Vidalamiini, which is the first assignment to this group and to the tribe level for any fish material from the Bauru Group. This study also offers an overview on the paleobiogeography of the Amiidae during the Late Cretaceous and an updated compilation of vidalamiine records during the Cretaceous, with a special focus on the freshwater records of this originally saltwater group. Finally, we also discuss the distribution of the tribes Vidalamiini and Calamopleurini during the Late Cretaceous, and the possibility that the North American and South American vidalamiines may have dispersed between the continents through a land connection. Keywords: Amiiformes, Amiidae, Vidalamiinae, Bauru Group, Late Cretaceous, biogeography. RESUMO – Os depósitos continentais do Cretáceo Superior do Grupo Bauru do Brasil possuem uma rica fauna fóssil de vertebrados, mas os estudos sobre os peixes fósseis da unidade são escassos. Este artigo descreve novas ocorrências da subfamília Vidalamiinae do grupo de peixes ósseos Amiidae (Halecomorphi: Amiiformes). As novas ocorrências são compostas por três centros vertebrais e três dentes isolados das formações Marília e Adamantina, que foram coletados nos municípios de Uberaba e Prata. Os fósseis aqui descritos não apenas ampliam o registro de Vidalamiinae para o Grupo Bauru, mas também esclarecem que a atribuição de dentes isolados a este grupo pode agora ser feita com mais certeza, o que não era o caso em muitos estudos anteriores. Adicionalmente, também remetemos os espécimes descritos provisoriamente aos Vidalamiini, que é a primeira atribuição a este grupo e ao nível de tribo para qualquer registro de peixes do Grupo Bauru. Este estudo também oferece uma visão geral da paleobiogeografia dos Amiidae durante o Cretáceo Superior e uma compilação atualizada dos registros de vidalamiine durante o Cretáceo, com foco especial nos registros de água doce desse grupo originalmente de água salgada. Por fim, também discutimos a distribuição das tribos Vidalamiini e Calamopleurini durante o Cretáceo Superior e a possibilidade de que os vidalamiines norte-americanos e sul-americanos tenham se dispersado entre os continentes por meio de uma cone","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46754867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Azevedo, Simone Souza de Moraes, Ana Carina Matos Silva, Alexandre Dacorso Daltro Milazzo, A. J. Machado, Ruth Souza dos Santos Rocha, C. F. Gromboni, Nailson Santos Alves, Gabriele Augusta Leal Ribeiro, G. M. Lima
Spatial and intra-annual variation of foraminifera and biogeochemical indicators in the Real estuary, northern coast of Bahia, Brazil. The aim of this research was to carry out the biogeochemical characterization of the Real estuary, northern coast of Bahia, using the seasonal variation of foraminifera and physical-chemical, sedimentological, and geochemical data. During the rainy season were obtained 324 foreheads (Jul/2013), with Trochammina inflata in abundance (75.85%). In the April campaign, 298 foraminifera were found in 10 sampling points, especially T. inflata (40.60%), Quinqueloculina lamarckiana (9.73%), Ammonia tepida (8.05%) and Trochammina globigeriniformis (5.70%). In the dry season, 148 foreheads belonging to 14 species were registered, such as Q. lamarckiana (21.19%), Trochammina sp. (10.60%), T. inflata (10.60%), Nonion sinensis (5.96%), Peneroplis proteus (5.96%), and Quinqueloculina bicornis (5.96%). In addition, the faunal composition reflects an environmental condition of high hydrodynamic energy, with clear evidence of oligohaline waters typical of environments with strong river discharges, and absence of anomalies in the foreheads, suggesting an environment without evident anthropogenic changes. The levels of Ca and Al, in both hydrological periods, varied significantly between the sampling stations, but they should not be causing adverse effects on the biota of the Real estuary. The contents of Mg (which come from primary sources) and Fe (which is punctual and seems to be a result of anthropic activity) found are above the reference limits, but does not appear to be causing changes in the balance of the local ecosystem. Keywords: foraminifera, estuary, trace metals, Northeast of Brazil, bioindicators, taphonomy. RESUMO – O objetivo da pesquisa foi realizar a caracterização biogeoquímica do estuário do Real, Litoral Norte-Bahia, utilizando a variação sazonal de foraminíferos e dados físico-químicos, sedimentológicos e geoquímicos. Foram obtidas 324 testas na estação chuvosa (Jul/2013), destacando-se Trochammina inflata (75,85%). Na campanha de abril, foram encontrados 298 foraminíferos em 10 pontos amostrais, destacando-se T. inflata (40,60%), Quinqueloculina lamarckiana (9,73%), Ammonia tepida (8,05%) e Trochammina globigeriniformis (5,70%). Na estação seca, registraram-se 148 testas pertencentes a 14 espécies, das quais destacam-se Q. lamarckiana (21,19%), Trochammina sp. (10,60%), T. inflata (10,60%), Nonion sinensis (5,96%), Peneroplis proteus (5,96%), Quinqueloculina bicornis (5,96%). Além disso, a composição faunística reflete uma condição ambiental de alta energia hidrodinâmica, com evidência claras de águas oligohalinas próprias de ambientes com fortes descargas fluviais, e ausências de anomalias nas testas, sugere um ambiente sem alterações antrópicas evidentes. Os teores de Ca e Al, em ambos os períodos hidrológicos variaram significativamente entre as estações de amostragem, mas não devem estar provocando efeitos
巴西巴伊亚北部海岸Real河口有孔虫及生物地球化学指标的空间年际变化。利用有孔虫的季节变化和理化、沉积学和地球化学数据，对巴伊亚北部海岸Real河口进行生物地球化学表征。雨季(2013年7月/2013年7月)共采集到324只额头，其中以膨体虫居多(75.85%)。在4月份的调查中，在10个采样点共检获有孔虫298种，其中以膨胀孔虫(40.60%)、蓝斑孔虫(9.73%)、暖氨孔虫(8.05%)和globigeriniformis有孔虫(5.70%)最多。旱季共记录到14种148只，分别为:lamarckiana(21.19%)、Trochammina sp.(10.60%)、T. inflata(10.60%)、Nonion sinensis(5.96%)、Peneroplis proteus(5.96%)和Quinqueloculina bicornis(5.96%)。此外，动物群组成反映了一个高水动力能的环境条件，有明显的低盐水证据，典型的强河流排放环境，而前额没有异常，表明没有明显的人为变化环境。在两个水文时期，Ca和Al的水平在采样站之间差异很大，但它们不应对真正河口的生物群造成不利影响。发现的Mg(来自原始来源)和Fe(准时的，似乎是人类活动的结果)的含量高于参考限度，但似乎没有引起当地生态系统平衡的变化。关键词:有孔虫，河口，微量金属，巴西东北部，生物指标，埋藏学resume - O目标的实现与目标的实现与特征的实现:biogeoquímica do estuário do Real, Litoral - north - bahia, utilizado a varial; foraminíferos e dados físico-químicos, sedimentológicos e geoquímicos。Foram obtidas 324 testas na estao chuvosa (july /2013)， destacanddo -se Trochammina inflata(75,85%)。Na campanha de abril, foram encontros 298 foraminíferos em 10 pontos amostrais, destacando-se T. inflata (40.60%)， Quinqueloculina lamarckiana(9.73%)，氨温虫(8.05%)和gloigeriniformis(5.70%)。Na estacao seca registraram-se 148甲壳pertencentes 14 especies, das法国destacam-se问:lamarckiana(21岁,19%),Trochammina sp。(10 60%),t . inflata (10 60%), Nonion sinensis (5 96%), Peneroplis变形杆菌(5 96%),Quinqueloculina bicornis(5 96%)。)云母，evidência ()， próprias ···············我们的研究对象是Ca e Al, em ambos Os períodos hidrológicos vararam significativeente entre as estações de amostragem, mas n o deve star provocando efeitos adversos co biota do estuário do Real。j os teores de Mg, que s o oriundos de fontes primárias, e de Fe, que pontual - de parece ser resultante de atividade antrópica, embora estejam acima do limited de referência, n orecem estar causando alterações no equilíbrio do ecossistema local。Palavras-chave: foraminíferos, estuário, metais trao, north deste do Brasil, bioindicators, tafonomia。
{"title":"Variação espacial e intra-anual de foraminíferos bentônicos e indicadores biogeoquímicos no estuário do Real, Litoral Norte da Bahia, Brasil","authors":"I. Azevedo, Simone Souza de Moraes, Ana Carina Matos Silva, Alexandre Dacorso Daltro Milazzo, A. J. Machado, Ruth Souza dos Santos Rocha, C. F. Gromboni, Nailson Santos Alves, Gabriele Augusta Leal Ribeiro, G. M. Lima","doi":"10.4072/rbp.2022.2.02","DOIUrl":"https://doi.org/10.4072/rbp.2022.2.02","url":null,"abstract":"Spatial and intra-annual variation of foraminifera and biogeochemical indicators in the Real estuary, northern coast of Bahia, Brazil. The aim of this research was to carry out the biogeochemical characterization of the Real estuary, northern coast of Bahia, using the seasonal variation of foraminifera and physical-chemical, sedimentological, and geochemical data. During the rainy season were obtained 324 foreheads (Jul/2013), with Trochammina inflata in abundance (75.85%). In the April campaign, 298 foraminifera were found in 10 sampling points, especially T. inflata (40.60%), Quinqueloculina lamarckiana (9.73%), Ammonia tepida (8.05%) and Trochammina globigeriniformis (5.70%). In the dry season, 148 foreheads belonging to 14 species were registered, such as Q. lamarckiana (21.19%), Trochammina sp. (10.60%), T. inflata (10.60%), Nonion sinensis (5.96%), Peneroplis proteus (5.96%), and Quinqueloculina bicornis (5.96%). In addition, the faunal composition reflects an environmental condition of high hydrodynamic energy, with clear evidence of oligohaline waters typical of environments with strong river discharges, and absence of anomalies in the foreheads, suggesting an environment without evident anthropogenic changes. The levels of Ca and Al, in both hydrological periods, varied significantly between the sampling stations, but they should not be causing adverse effects on the biota of the Real estuary. The contents of Mg (which come from primary sources) and Fe (which is punctual and seems to be a result of anthropic activity) found are above the reference limits, but does not appear to be causing changes in the balance of the local ecosystem. Keywords: foraminifera, estuary, trace metals, Northeast of Brazil, bioindicators, taphonomy. RESUMO – O objetivo da pesquisa foi realizar a caracterização biogeoquímica do estuário do Real, Litoral Norte-Bahia, utilizando a variação sazonal de foraminíferos e dados físico-químicos, sedimentológicos e geoquímicos. Foram obtidas 324 testas na estação chuvosa (Jul/2013), destacando-se Trochammina inflata (75,85%). Na campanha de abril, foram encontrados 298 foraminíferos em 10 pontos amostrais, destacando-se T. inflata (40,60%), Quinqueloculina lamarckiana (9,73%), Ammonia tepida (8,05%) e Trochammina globigeriniformis (5,70%). Na estação seca, registraram-se 148 testas pertencentes a 14 espécies, das quais destacam-se Q. lamarckiana (21,19%), Trochammina sp. (10,60%), T. inflata (10,60%), Nonion sinensis (5,96%), Peneroplis proteus (5,96%), Quinqueloculina bicornis (5,96%). Além disso, a composição faunística reflete uma condição ambiental de alta energia hidrodinâmica, com evidência claras de águas oligohalinas próprias de ambientes com fortes descargas fluviais, e ausências de anomalias nas testas, sugere um ambiente sem alterações antrópicas evidentes. Os teores de Ca e Al, em ambos os períodos hidrológicos variaram significativamente entre as estações de amostragem, mas não devem estar provocando efeitos","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46679969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Taynara Cristina Matos Martins, J. Soares, Hudson Pereira Santos
Ichnofossils of the Guamá Sandstone (Pará, Brazil): potential Silurian records. The Guamá Sandstone is a unit restricted to the Bragantina Platform in the northeast Pará State. It is characterized by thick layers of well-rounded, well-sorted, medium-grained quartz-sandstone with textural and compositional maturity. In general, the layers exhibit few preserved primary sedimentary structures. The facies association indicates a sandy coastal paleoenvironment comprising the foreshore and shoreface zones. We found in the Guamá Sandstone the ichnospecies Psammichnites isp., cf. Schaubcylindrichnus coronus, Skolithos isp., Skolithos linearis and V-shaped vertical excavations, which commonly compose a mixture of the Cruziana and Skolithos ichnofacies. On the basis of the regular distribution alternating between Skolithos and Psammichnites in the sandstone layers, and the low ichnodiversity and local abundance, we suggest that periodic changes in energy and sedimentation rate occurred. These characteristics of the Guamá Sandstone ichnoassemblage are similar to those of the Ipu (Parnaíba Basin) and Nhamundá (Amazon Basin) formations, although only Skolithos occurs in both units. Keywords: Guamá Sandstone, ichnofacies, foreshore-shoreface, Lower Silurian, paleoenvironment. RESUMO – O Arenito do Guamá é uma unidade restrita à Plataforma Bragantina no nordeste do Estado do Pará. Caracteriza-se por espessas camadas de quartzo-arenito de grão médio, bem arredondadas, bem selecionadas, com maturidade textural e composicional. Em geral, as camadas apresentam poucas estruturas sedimentares primárias preservadas. A associação de fácies indica um paleoambiente costeiro arenoso compreendendo as zonas de foreshore e shoreface. Encontramos no Arenito do Guamá a icnoespécie Psammichnites isp., cf. Schaubcylindrichnus coronus, Skolithos isp., Skolithos linearis e escavações verticais em forma de V, que comumente compõem uma mistura das icnofácies Cruziana e Skolithos. Com base na distribuição regular alternada entre Skolithos e Psammichnitos nas camadas de arenito e a baixa icnodiversidade e abundância local, sugerimos que ocorreram mudanças periódicas na energia e na taxa de sedimentação. Essas características da icnoassembleia do Arenito do Guamá são semelhantes às das formações Ipu (Bacia do Parnaíba) e Nhamundá (Bacia Amazônica), embora apenas Skolithos ocorra em ambas as unidades. Palavras-chave: Arenito do Guamá, icnofácies, foreshore-shoreface, Siluriano Inferior, paleoambiente.
{"title":"Icnofósseis no Arenito do Guamá (Pará, Brasil): potenciais registros silurianos","authors":"Taynara Cristina Matos Martins, J. Soares, Hudson Pereira Santos","doi":"10.4072/rbp.2022.2.01","DOIUrl":"https://doi.org/10.4072/rbp.2022.2.01","url":null,"abstract":"Ichnofossils of the Guamá Sandstone (Pará, Brazil): potential Silurian records. The Guamá Sandstone is a unit restricted to the Bragantina Platform in the northeast Pará State. It is characterized by thick layers of well-rounded, well-sorted, medium-grained quartz-sandstone with textural and compositional maturity. In general, the layers exhibit few preserved primary sedimentary structures. The facies association indicates a sandy coastal paleoenvironment comprising the foreshore and shoreface zones. We found in the Guamá Sandstone the ichnospecies Psammichnites isp., cf. Schaubcylindrichnus coronus, Skolithos isp., Skolithos linearis and V-shaped vertical excavations, which commonly compose a mixture of the Cruziana and Skolithos ichnofacies. On the basis of the regular distribution alternating between Skolithos and Psammichnites in the sandstone layers, and the low ichnodiversity and local abundance, we suggest that periodic changes in energy and sedimentation rate occurred. These characteristics of the Guamá Sandstone ichnoassemblage are similar to those of the Ipu (Parnaíba Basin) and Nhamundá (Amazon Basin) formations, although only Skolithos occurs in both units. Keywords: Guamá Sandstone, ichnofacies, foreshore-shoreface, Lower Silurian, paleoenvironment. RESUMO – O Arenito do Guamá é uma unidade restrita à Plataforma Bragantina no nordeste do Estado do Pará. Caracteriza-se por espessas camadas de quartzo-arenito de grão médio, bem arredondadas, bem selecionadas, com maturidade textural e composicional. Em geral, as camadas apresentam poucas estruturas sedimentares primárias preservadas. A associação de fácies indica um paleoambiente costeiro arenoso compreendendo as zonas de foreshore e shoreface. Encontramos no Arenito do Guamá a icnoespécie Psammichnites isp., cf. Schaubcylindrichnus coronus, Skolithos isp., Skolithos linearis e escavações verticais em forma de V, que comumente compõem uma mistura das icnofácies Cruziana e Skolithos. Com base na distribuição regular alternada entre Skolithos e Psammichnitos nas camadas de arenito e a baixa icnodiversidade e abundância local, sugerimos que ocorreram mudanças periódicas na energia e na taxa de sedimentação. Essas características da icnoassembleia do Arenito do Guamá são semelhantes às das formações Ipu (Bacia do Parnaíba) e Nhamundá (Bacia Amazônica), embora apenas Skolithos ocorra em ambas as unidades. Palavras-chave: Arenito do Guamá, icnofácies, foreshore-shoreface, Siluriano Inferior, paleoambiente.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49580980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dictyozamites barnardi sp. nov. and Dictyozamites fakhri sp. nov. are the second and third species of Dictyozamites to be described from Iran and the Middle East. They derive from the Rhaetic Kalariz Formation (Shemshak Group) of the Ramsar area, Alborz Mountains, North of Iran. Dictyozamites barnardi sp. nov. is distinguished especially by the short and curved to strongly falcate pinnae and clearly auriculate bases and Dictyozamites fakhri sp. nov. is distinguished particularly by its long, slightly falcate and very elongated triangular pinnae, opposite to sub opposite pinnae position and clearly auriculate. Keywords: Dictyozamites, Rhaetian, Kalariz Formation, Iran. RESUMO – Dictyozamites barnardi sp. nov. e Dictyozamites fakhri sp. nov. são a segunda e terceira espécies de Dictyozamites a serem descritas para o Irã e o Oriente Médio. Elas derivam da Formação Kalariz (Grupo Shemshak, Rético) da área de Ramsar, Alborz Mountains, Norte do Irã. Dictyozamites barnardi sp. nov. distingue-se especialmente pelas pinas curtas e curvas a fortemente falcadas e bases claramente auriculadas e Dictyozamites fakhri sp. nov. distingue-se particularmente pelas suas pinas triangulares longas, ligeiramente falcadas e muito alongadas, opostas à posição das pinas subpostas e claramente auriculadas. Palavras-chave: Dictyozamites, Rético, Formação Kalariz, Irã.
Dictyozamites barnardi sp. 11和Dictyozamites fakhri sp. 11是在伊朗和中东地区发现的第二种和第三种Dictyozamites。它们来自伊朗北部Alborz山脉Ramsar地区的Rhaetic Kalariz组(Shemshak组)。Dictyozamites barnardi sp. 11 .的主要特征是短而弯曲的强镰形的羽状基部和明显的耳状基部，Dictyozamites fakhri sp. 11 .的主要特征是其长而略镰形的非常细长的三角形羽状基部，相对于近对生的羽状位置，明显的耳状。关键词:双氧杂石，雷蒂安，卡拉里兹组，伊朗resume - Dictyozamites barnardi sp. 11月11日- Dictyozamites fakhri sp. 11月15日- a - seunda - terceira espacemcies de Dictyozamites a - seras描述了第Irã段的描述。Elas衍生am da forma o Kalariz (Grupo Shemshak, r) da área de Ramsar, Alborz Mountains, north do Irã。Dictyozamites barnardi sp. 11 .区分-特别区分pelas pinas curtas, curtas, fortemente falcadas, clamente aurculadas, clamente falcadas, trangulares longas, ligeiramente falcadas, muito adas, postas, ponstas, ponstas, subpostas, clamente aurculadas。Palavras-chave: Dictyozamites, r， forma o Kalariz, Irã。
{"title":"Two new species of Dictyozamites (Bennettitales) from the Rhaetic Kalariz Formation, North of Iran","authors":"Javad Saadatnejad","doi":"10.4072/rbp.2022.2.03","DOIUrl":"https://doi.org/10.4072/rbp.2022.2.03","url":null,"abstract":"Dictyozamites barnardi sp. nov. and Dictyozamites fakhri sp. nov. are the second and third species of Dictyozamites to be described from Iran and the Middle East. They derive from the Rhaetic Kalariz Formation (Shemshak Group) of the Ramsar area, Alborz Mountains, North of Iran. Dictyozamites barnardi sp. nov. is distinguished especially by the short and curved to strongly falcate pinnae and clearly auriculate bases and Dictyozamites fakhri sp. nov. is distinguished particularly by its long, slightly falcate and very elongated triangular pinnae, opposite to sub opposite pinnae position and clearly auriculate. Keywords: Dictyozamites, Rhaetian, Kalariz Formation, Iran. RESUMO – Dictyozamites barnardi sp. nov. e Dictyozamites fakhri sp. nov. são a segunda e terceira espécies de Dictyozamites a serem descritas para o Irã e o Oriente Médio. Elas derivam da Formação Kalariz (Grupo Shemshak, Rético) da área de Ramsar, Alborz Mountains, Norte do Irã. Dictyozamites barnardi sp. nov. distingue-se especialmente pelas pinas curtas e curvas a fortemente falcadas e bases claramente auriculadas e Dictyozamites fakhri sp. nov. distingue-se particularmente pelas suas pinas triangulares longas, ligeiramente falcadas e muito alongadas, opostas à posição das pinas subpostas e claramente auriculadas. Palavras-chave: Dictyozamites, Rético, Formação Kalariz, Irã.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46783403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Brachiopods of the superfamily Chonetoidea are abundantly found in Devonian rocks in the Paraná Basin (Brazil). Despite this, only two species were formally known: Pleurochonetes falklandicus and Australostrophia mesembria, while at least 34 other taxa are known in other locations also within the Malvinokaffric Realm. In this contribution we present nine new taxa of Chonetoidea from the Ponta Grossa (late Pragian–early Emsian) and São Domingos (late Emsian–Frasnian) formations in the Paraná Basin: Babinia parvula maxima ssp. nov., Kentronetes? iclaense, Kentronetes? ortegae?, Sanjuanetes? sp., Chonostrophia? aff. truyolsae, Chonetidae indet., Pleurochonetes? comstocki?, Notiochonetes skottsbergi and Pleurochonetes surucoi?. Additionally, we emended the diagnosis of Babinia parvula. This expands the known diversity of Devonian Chonetoidea of the Paraná Basin. We also discuss the likely living environment of the identified taxa, based on the outcrops from which they came. The identification of these taxa provide new paleobiogeographic and chronostratigraphic information, allowing interpretations about possible affinities and migration routes of these benthic organisms within the Malvinokaffric Realm regions. Keywords: chonetoideans, Malvinokaffric Realm, Lower–Middle Devonian, systematic, paleoenvironments, paleobiogeography.
{"title":"New occurrences of Malvinokaffric Chonetoidea (Brachiopoda) in the Paraná Basin, Devonian, Brazil","authors":"R. Videira-Santos, S. Scheffler, A. C. Fernandes","doi":"10.4072/rbp.2022.1.01","DOIUrl":"https://doi.org/10.4072/rbp.2022.1.01","url":null,"abstract":"Brachiopods of the superfamily Chonetoidea are abundantly found in Devonian rocks in the Paraná Basin (Brazil). Despite this, only two species were formally known: Pleurochonetes falklandicus and Australostrophia mesembria, while at least 34 other taxa are known in other locations also within the Malvinokaffric Realm. In this contribution we present nine new taxa of Chonetoidea from the Ponta Grossa (late Pragian–early Emsian) and São Domingos (late Emsian–Frasnian) formations in the Paraná Basin: Babinia parvula maxima ssp. nov., Kentronetes? iclaense, Kentronetes? ortegae?, Sanjuanetes? sp., Chonostrophia? aff. truyolsae, Chonetidae indet., Pleurochonetes? comstocki?, Notiochonetes skottsbergi and Pleurochonetes surucoi?. Additionally, we emended the diagnosis of Babinia parvula. This expands the known diversity of Devonian Chonetoidea of the Paraná Basin. We also discuss the likely living environment of the identified taxa, based on the outcrops from which they came. The identification of these taxa provide new paleobiogeographic and chronostratigraphic information, allowing interpretations about possible affinities and migration routes of these benthic organisms within the Malvinokaffric Realm regions. Keywords: chonetoideans, Malvinokaffric Realm, Lower–Middle Devonian, systematic, paleoenvironments, paleobiogeography.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48307208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. T. Bergue, M. Maranhão, Christiano Ng, M. Naumcheva
New ostracod species are described for Middle to Upper Permian (Guadalupian) rocks of the Teresina Formation, Paraná Basin, from two localities in the São Paulo State, southwestern Brazil: Xavante Dam and Pau Preto Quarry. Paranacythere nigripallus gen. nov. and sp. nov., Velatomorpha xavante sp. nov., and Velatomorpha pseudoaltilis sp. nov. are herein described. The association Velatomorpha–Paranacythere is proposed as typical of Permian mixohaline environments of the Teresina Formation, and is the most abundant in the two studied localities. Paranacythere nigripallus gen. nov. and sp. nov. is proposed to accommodate a very abundant species with typically cytheroidean characteristics, and tentatively ascribed to the family Cytheruridae. Some ecological remarks are presented based on ostracod population age structure, biostratinomy and taxonomic composition of assemblages. The diagnosis of Velatomorpha Tibert & Dewey is emended. Keywords: evolution, marginal marine environments, paleoecology, Teresina Formation, taxonomy.
{"title":"A Permian mixohaline ostracod association of the Teresina Formation, Paraná Basin, Brazil","authors":"C. T. Bergue, M. Maranhão, Christiano Ng, M. Naumcheva","doi":"10.4072/rbp.2022.1.02","DOIUrl":"https://doi.org/10.4072/rbp.2022.1.02","url":null,"abstract":"New ostracod species are described for Middle to Upper Permian (Guadalupian) rocks of the Teresina Formation, Paraná Basin, from two localities in the São Paulo State, southwestern Brazil: Xavante Dam and Pau Preto Quarry. Paranacythere nigripallus gen. nov. and sp. nov., Velatomorpha xavante sp. nov., and Velatomorpha pseudoaltilis sp. nov. are herein described. The association Velatomorpha–Paranacythere is proposed as typical of Permian mixohaline environments of the Teresina Formation, and is the most abundant in the two studied localities. Paranacythere nigripallus gen. nov. and sp. nov. is proposed to accommodate a very abundant species with typically cytheroidean characteristics, and tentatively ascribed to the family Cytheruridae. Some ecological remarks are presented based on ostracod population age structure, biostratinomy and taxonomic composition of assemblages. The diagnosis of Velatomorpha Tibert & Dewey is emended. Keywords: evolution, marginal marine environments, paleoecology, Teresina Formation, taxonomy.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44542711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jonathan S. Pelegrín, S. Quijano, Leonardo Belalcázar, Alberto Benavides-Herrán, Sebastián Escobar-Flórez, Dimila Mothé, L. Avilla
The Proboscidea were very prominent in South American ecosystems during the Pleistocene and part of the Holocene. Specifically, in Valle del Cauca (Colombia), fossils of these large mammals have been found, reflecting an abundant presence in the region. In this work, a mandibular fragment with a complete last molar (m3) is reported, found near the bed of the Cauca River, in the Juanchito municipality of Santiago de Cali. According to the morphological features of the specimen, it is proposed that the remains belong to the proboscidean Notiomastodon platensis. This study emphasizes the large geographical distribution of this proboscidean in South America, including the Valle del Cauca, and provides new information on its presence in Colombia. In a paleoecological context, this work supports a generalist condition based on the use of food resources associated with the tropical dry forest during the processes of glacial and interglacial fluctuation that this type of ecosystem experienced during the Pleistocene epoch and that led to various changes in habitat aridity, fragmentation, and heterogeneity. Keywords: Notiomastodon, Quaternary, paleoecology, megafauna, South America.
{"title":"Report on mandibular remains of Notiomastodon platensis (Mammalia, Proboscidea) and review of its fossil record in the paleoecological context of Valle del Cauca, Colombia","authors":"Jonathan S. Pelegrín, S. Quijano, Leonardo Belalcázar, Alberto Benavides-Herrán, Sebastián Escobar-Flórez, Dimila Mothé, L. Avilla","doi":"10.4072/rbp.2022.1.07","DOIUrl":"https://doi.org/10.4072/rbp.2022.1.07","url":null,"abstract":"The Proboscidea were very prominent in South American ecosystems during the Pleistocene and part of the Holocene. Specifically, in Valle del Cauca (Colombia), fossils of these large mammals have been found, reflecting an abundant presence in the region. In this work, a mandibular fragment with a complete last molar (m3) is reported, found near the bed of the Cauca River, in the Juanchito municipality of Santiago de Cali. According to the morphological features of the specimen, it is proposed that the remains belong to the proboscidean Notiomastodon platensis. This study emphasizes the large geographical distribution of this proboscidean in South America, including the Valle del Cauca, and provides new information on its presence in Colombia. In a paleoecological context, this work supports a generalist condition based on the use of food resources associated with the tropical dry forest during the processes of glacial and interglacial fluctuation that this type of ecosystem experienced during the Pleistocene epoch and that led to various changes in habitat aridity, fragmentation, and heterogeneity. Keywords: Notiomastodon, Quaternary, paleoecology, megafauna, South America.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47635917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The nomenclatural status of Phytosaurus Jæger is here analyzed in accordance with the International Code of Zoological Nomenclature. In the past, several authors have interpreted it as both a family-group and/or a genus-group name, but each of these approaches fails in several articles of the Code. Phytosaurus Jæger is here interpreted as originally established for a collective-group and cannot be used as a nominal genus in binomina, but takes precedence over any other younger homonym, and the first available one is Phytosaurus Wagler. Being an invalid junior homonym, the class-group name Phytosauria Baur and the family-group name Phytosauridae Lydekker, which are based on Phytosaurus Wagler, are ultimately rejected. Conversely, the class-group names Parasuchia Huxley and Belodontia Brauns, as well as the family-group name Belodontidae Cope, are older but have some taxonomic restrictions in relation to Belodon plieningeri Meyer. To avoid proposing new names for old ones, the solution to fix the higher-order nomenclature for phytosaurs is to designate a neotype for Belodon plieningeri Meyer. Keywords: Parasuchia, Phytosauria, Belodontia, Archosauriformes, Triassic, collective-group.
{"title":"Phytosaurian Nomenclature: Parasuchia, Phytosauria or Belodontia?","authors":"Edio-Ernst Kischlat","doi":"10.4072/rbp.2022.1.03","DOIUrl":"https://doi.org/10.4072/rbp.2022.1.03","url":null,"abstract":"The nomenclatural status of Phytosaurus Jæger is here analyzed in accordance with the International Code of Zoological Nomenclature. In the past, several authors have interpreted it as both a family-group and/or a genus-group name, but each of these approaches fails in several articles of the Code. Phytosaurus Jæger is here interpreted as originally established for a collective-group and cannot be used as a nominal genus in binomina, but takes precedence over any other younger homonym, and the first available one is Phytosaurus Wagler. Being an invalid junior homonym, the class-group name Phytosauria Baur and the family-group name Phytosauridae Lydekker, which are based on Phytosaurus Wagler, are ultimately rejected. Conversely, the class-group names Parasuchia Huxley and Belodontia Brauns, as well as the family-group name Belodontidae Cope, are older but have some taxonomic restrictions in relation to Belodon plieningeri Meyer. To avoid proposing new names for old ones, the solution to fix the higher-order nomenclature for phytosaurs is to designate a neotype for Belodon plieningeri Meyer. Keywords: Parasuchia, Phytosauria, Belodontia, Archosauriformes, Triassic, collective-group.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44531073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ensieh Behdani, Fatemeh Hadani, M. N. Moghaddam, A. Khazaei
Biostratigraphic studies of the Baghamshah Formation from the Birg section in the northwest of Birjand (Lut Block) are done here for the first time based on the calcareous nannofossils. In the studied section, 82 samples were taken, and smear slides were prepared. The examination of the collected samples resulted in the identification of 65 calcareous nannofossil and 11 didemnid ascidian spicules species belonging to 38 genera corresponding from CC1 to CC4b biozones with the age of early Berriasian to early Hauterivian, according to the Sissingh biozonation. The calcareous nannofossil assemblages are dominated by the following genera: Watznaueria, Nannoconus, Conusphaera, and Cyclagelosphaera. Keywords: Birjand, Baghamshah Formation, biozonation, Biostratigraphy, Early Berriasian, Early Hauterivian.
{"title":"Calcareous nannofossil biostratigraphy of Baghamshah Formation in Eastern Iran, Lut Block (Birg Section)","authors":"Ensieh Behdani, Fatemeh Hadani, M. N. Moghaddam, A. Khazaei","doi":"10.4072/rbp.2022.1.04","DOIUrl":"https://doi.org/10.4072/rbp.2022.1.04","url":null,"abstract":"Biostratigraphic studies of the Baghamshah Formation from the Birg section in the northwest of Birjand (Lut Block) are done here for the first time based on the calcareous nannofossils. In the studied section, 82 samples were taken, and smear slides were prepared. The examination of the collected samples resulted in the identification of 65 calcareous nannofossil and 11 didemnid ascidian spicules species belonging to 38 genera corresponding from CC1 to CC4b biozones with the age of early Berriasian to early Hauterivian, according to the Sissingh biozonation. The calcareous nannofossil assemblages are dominated by the following genera: Watznaueria, Nannoconus, Conusphaera, and Cyclagelosphaera. Keywords: Birjand, Baghamshah Formation, biozonation, Biostratigraphy, Early Berriasian, Early Hauterivian.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42715776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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