D. Ferraro, L. Cabo, M. Libertelli, M. Quartino, L. Clérici, Soledad Tancoff, Y. Davies, Laura Cruz
{"title":"Female scientists from the Museo Argentino de Ciencias Naturales: “The four from Melchior”.","authors":"D. Ferraro, L. Cabo, M. Libertelli, M. Quartino, L. Clérici, Soledad Tancoff, Y. Davies, Laura Cruz","doi":"10.22179/revmacn.22.708","DOIUrl":"https://doi.org/10.22179/revmacn.22.708","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"22 1","pages":"249-264"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68257080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Santamarina, V. Barreda, D. Paz, Camila Tettamanti, A. Iglesias, D. Poiré, A. Varela
Here we describe the spore and pollen assemblages recovered from the La Anita Formation, Late Cretaceous, Austral-Magallanes Basin (~50°S). This unit shows a high diversity of spores, with subordinate gymnosperms (mainly represented by Podocarpaceae) and angiosperms (mainly represented by Proteaceae and Arecaceae). The abundance of these groups varies between the two fertile studied levels, being one dominated by ferns (mainly Cyathidites minor and Laevigatosporites ovatus) and the other by gymnosperms (Podocarpidites spp.). The presence of aquatic ferns (Azollopsis), diverse Podocarpaceae and key angiosperm taxa (such as Arecipites, Clavatipollenites, Dichastopollenites, and Spinizonocolpites) is indicative of warm and hyper-humid conditions. The great abundance of Arecaceae and the presence of some key taxa (e.g. Azollopsis sp., Ericipites scabratus, Peninsulapollis gillii, Proteacidites spp.) support a probable Maastrichtian age for the uppermost strata of the La Anita Formation. The multivariate statistical analysis here conducted showed that the La Anita Formation has its greatest similarity with the La Irene Formation (Maastrichtian from the Austral-Magallanes Basin). Both formations are also related with other coeval palynofloras from Patagonia and Antarctica.
{"title":"Palynoflora from the La Anita Formation (Maastrichtian), Austral-Magallanes Basin, Argentina","authors":"P. Santamarina, V. Barreda, D. Paz, Camila Tettamanti, A. Iglesias, D. Poiré, A. Varela","doi":"10.22179/revmacn.22.664","DOIUrl":"https://doi.org/10.22179/revmacn.22.664","url":null,"abstract":"Here we describe the spore and pollen assemblages recovered from the La Anita Formation, Late Cretaceous, Austral-Magallanes Basin (~50°S). This unit shows a high diversity of spores, with subordinate gymnosperms (mainly represented by Podocarpaceae) and angiosperms (mainly represented by Proteaceae and Arecaceae). The abundance of these groups varies between the two fertile studied levels, being one dominated by ferns (mainly Cyathidites minor and Laevigatosporites ovatus) and the other by gymnosperms (Podocarpidites spp.). The presence of aquatic ferns (Azollopsis), diverse Podocarpaceae and key angiosperm taxa (such as Arecipites, Clavatipollenites, Dichastopollenites, and Spinizonocolpites) is indicative of warm and hyper-humid conditions. The great abundance of Arecaceae and the presence of some key taxa (e.g. Azollopsis sp., Ericipites scabratus, Peninsulapollis gillii, Proteacidites spp.) support a probable Maastrichtian age for the uppermost strata of the La Anita Formation. The multivariate statistical analysis here conducted showed that the La Anita Formation has its greatest similarity with the La Irene Formation (Maastrichtian from the Austral-Magallanes Basin). Both formations are also related with other coeval palynofloras from Patagonia and Antarctica.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"22 1","pages":"45-56"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68256727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Príncipe, D. Minaya, Cipriano, Azucena Naupay, J. Iannacone
Peru has a great diversity of birds, having more than 1870 species in its territory. However, studies on chewing lice (Phthiraptera) in birds from Peru are still limited. The objective of this study is to contribute to the knowledge of the diversity of lice in birds of Peru. The material used comes from the Zoological Collection of the Natural History Museum of the Universidad Nacional Federico Villarreal, Lima, Peru. Ten species of lice distributed in three families were identified: three species of the Menoponidae family, five species of Philopteridae and two species of Ricinidae collected from seven species of birds. This work records for the first time Hohorstiella lata Piaget, 1880, Quadraceps eugrammicus (Burmeister, 1838), Trochiloecetes illumani Carriker, 1960 and Ricinus frenatus Burmeister, 1838 in Peru; likewise, four new hosts of the order Passeriformes are registered for Mayriphilopterus ernsti Mey, 2004, Threnetes leucurus (Linnaeus, 1766) as a new host for T. illumani and two new hosts for R. frenatus; Larus belcheri Vigors, 1829 is also reported as a new host for Quadraceps eugrammicus (Burmeister, 1838) and Austromenopon transversum Denny, 1842.
{"title":"Contributions to the knowledge of lice diversity (Phthiraptera: Amblycera and Ischnocera) in birds from Peru","authors":"F. Príncipe, D. Minaya, Cipriano, Azucena Naupay, J. Iannacone","doi":"10.22179/revmacn.22.697","DOIUrl":"https://doi.org/10.22179/revmacn.22.697","url":null,"abstract":"Peru has a great diversity of birds, having more than 1870 species in its territory. However, studies on chewing lice (Phthiraptera) in birds from Peru are still limited. The objective of this study is to contribute to the knowledge of the diversity of lice in birds of Peru. The material used comes from the Zoological Collection of the Natural History Museum of the Universidad Nacional Federico Villarreal, Lima, Peru. Ten species of lice distributed in three families were identified: three species of the Menoponidae family, five species of Philopteridae and two species of Ricinidae collected from seven species of birds. This work records for the first time Hohorstiella lata Piaget, 1880, Quadraceps eugrammicus (Burmeister, 1838), Trochiloecetes illumani Carriker, 1960 and Ricinus frenatus Burmeister, 1838 in Peru; likewise, four new hosts of the order Passeriformes are registered for Mayriphilopterus ernsti Mey, 2004, Threnetes leucurus (Linnaeus, 1766) as a new host for T. illumani and two new hosts for R. frenatus; Larus belcheri Vigors, 1829 is also reported as a new host for Quadraceps eugrammicus (Burmeister, 1838) and Austromenopon transversum Denny, 1842.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"65 1","pages":"219-229"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68257027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":": The sloths Scelidotheriinae (Xenarthra, Folivora): taxonomy, biocronology, and biogeography","authors":"Ángel Ramón Miño Boilini, S. Quiñones","doi":"10.22179/revmacn.22.681","DOIUrl":"https://doi.org/10.22179/revmacn.22.681","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"22 1","pages":"201-218"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68256870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Remesal, M. E. Cerredo, P. Cordenons, J. Albite
This contribution deals with the Corona Chico Vulcanites, within the Somun Cura Magmatic Province, northern Extra-Andean Patagonia. The studied area is located to the north of the Alta Sierra de Somun Cura Volcanic Complex and is made of several basaltic volcanic buildings of varied morphologies: spatter cones, tuff ring and long lava flows related to small shield volcanoes (of scutulum type). Petrographic characteristics as well as whole rock chemical composition suggest a time progressive increase in alkalis content and a shift from early transitional terms to basanitic rocks in the latest stages. A simulation of the source yielded for Las Lomadas rocks an astenospheric source in the garnet-spinel facies, with associated low partial melting percentages (< 7-8%). Within the studied rock set, the spatter cones sequence displays geochemical affinities with the basaltic component of Alta Sierra de Somun Cura Volcanic Complex.
这篇文章涉及位于安第斯山脉北部巴塔哥尼亚的索蒙库拉岩浆省内的科罗娜奇科火山。研究区域位于Alta Sierra de Somun Cura火山复合体的北部，由几个不同形态的玄武岩火山建筑组成:喷溅锥，凝灰岩环和与小型盾状火山(胸骨型)相关的长熔岩流。岩石学特征和全岩化学成分表明，碱含量呈时间递进式增加，晚期由早期过渡期向玄武质过渡。模拟结果表明，Las Lomadas岩石为石榴石-尖晶石相的小行星圈源，其部分熔融百分比较低(< 7-8%)。在研究的岩石组中，飞溅锥序列与Alta Sierra de Somun Cura火山杂岩的玄武岩组分具有地球化学亲和性。
{"title":"The volcanic association of Las Lomadas area, Corona Chico Volcanites. Somún Curá Magmatism. Río Negro province, Argentina","authors":"M. Remesal, M. E. Cerredo, P. Cordenons, J. Albite","doi":"10.22179/revmacn.21.635","DOIUrl":"https://doi.org/10.22179/revmacn.21.635","url":null,"abstract":"This contribution deals with the Corona Chico Vulcanites, within the Somun Cura Magmatic Province, northern Extra-Andean Patagonia. The studied area is located to the north of the Alta Sierra de Somun Cura Volcanic Complex and is made of several basaltic volcanic buildings of varied morphologies: spatter cones, tuff ring and long lava flows related to small shield volcanoes (of scutulum type). Petrographic characteristics as well as whole rock chemical composition suggest a time progressive increase in alkalis content and a shift from early transitional terms to basanitic rocks in the latest stages. A simulation of the source yielded for Las Lomadas rocks an astenospheric source in the garnet-spinel facies, with associated low partial melting percentages (< 7-8%). Within the studied rock set, the spatter cones sequence displays geochemical affinities with the basaltic component of Alta Sierra de Somun Cura Volcanic Complex.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44209299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: This work provides for the first time records of the genus Sarcofahrtiopsis Hall (Diptera: Sarcophagidae) in Argentina and Ecuador. A new species of the genus collected in the Humid Chaco ecoregion of Argentina is described, S. spinetta sp. nov. Also, we report new distributional records for S. cuneata (Townsend) from Argentina and Ecuador. A key including all the species of Sarcofahrtiopsis and comparative illustrations on the phallic structures to diagnose and separate the species are provided.
{"title":"The genus Sarcofahrtiopsis Hall (Diptera: Sarcophagidae): description of S. spinetta sp. nov. and new records of S. cuneata in South America","authors":"P. Mulieri, M. I. Dufek","doi":"10.22179/revmacn.21.641","DOIUrl":"https://doi.org/10.22179/revmacn.21.641","url":null,"abstract":"Abstract: This work provides for the first time records of the genus Sarcofahrtiopsis Hall (Diptera: Sarcophagidae) in Argentina and Ecuador. A new species of the genus collected in the Humid Chaco ecoregion of Argentina is described, S. spinetta sp. nov. Also, we report new distributional records for S. cuneata (Townsend) from Argentina and Ecuador. A key including all the species of Sarcofahrtiopsis and comparative illustrations on the phallic structures to diagnose and separate the species are provided.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43811835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Three new genera are described, Epactiohellica based on a new species, E. farinai, Alloeohellica based on another new species A. faundezi, and Hellicoides based on the known species Hellica johni Froeschner. The genus Hellica is redescribed with two known species H. nitida Haglund and H. johnpolhemi Froeschner and one new species, H. kolla. Fifth nymphal instar of Hellicoides johni is described for the first time and fifth nymphal instar of H. nitida is redescribed. Distributional (biogeography, distributional patterns), ecological (coloration, host plants) and biological characters (nymphs, eggs) of these genera are discussed.
{"title":"Revision of genus Hellica Stål, 1867 and description of three new genera of South American Lanopini (Hemiptera: Acanthosomatidae: Blaudusinae)","authors":"D. Carpintero, S. D. Biase","doi":"10.22179/revmacn.21.632","DOIUrl":"https://doi.org/10.22179/revmacn.21.632","url":null,"abstract":"Three new genera are described, Epactiohellica based on a new species, E. farinai, Alloeohellica based on another new species A. faundezi, and Hellicoides based on the known species Hellica johni Froeschner. The genus Hellica is redescribed with two known species H. nitida Haglund and H. johnpolhemi Froeschner and one new species, H. kolla. Fifth nymphal instar of Hellicoides johni is described for the first time and fifth nymphal instar of H. nitida is redescribed. Distributional (biogeography, distributional patterns), ecological (coloration, host plants) and biological characters (nymphs, eggs) of these genera are discussed.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47096896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Se describe e ilustra Cryptognathus amalfitanii sp. nov. en base a muestras colectadas en epifitas de la especie Tillandsia aeranthos (Bromeliaceae) en varias especies de arboles en Buenos Aires, Argentina.
{"title":"Notes on Prostigmata of Argentina 1: A new species of the genus Cryptognathus Kramer (Acari:Cryptognathidae)","authors":"A. Porta","doi":"10.22179/revmacn.21.640","DOIUrl":"https://doi.org/10.22179/revmacn.21.640","url":null,"abstract":"Se describe e ilustra Cryptognathus amalfitanii sp. nov. en base a muestras colectadas en epifitas de la especie Tillandsia aeranthos (Bromeliaceae) en varias especies de arboles en Buenos Aires, Argentina.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48768720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Novas, F. Agnolín, S. Rozadilla, A. Aranciaga-Rolando, Federico Brissón-Eli, M. J. Motta, M. A. Cerroni, M. Ezcurra, A. Martinelli, Julia D´Angelo, Gerardo P. Álvarez-Herrera, Adriel R Gentil, S. Bogan, N. Chimento, Jordi A. Garcia-Marsà, G. E. L. Coco, S. Miquel, F. Brito, E. Vera, V. P. Loinaze, M. S. Fernández, L. Salgado
The first fossil remains of vertebrates, invertebrates, plants and palynomorphs of the Chorrillo Formation (Austral Basin), about 30km to the SW of the town of El Calafate (Province of Santa Cruz), are described. Fossils include the elasmarian (basal Iguanodontia) Isasicursor santacrucensis gen. et sp. nov., the large titanosaur Nullotitan glaciaris gen. et sp. nov., both large and small Megaraptoridae indet., and fragments of sauropod and theropod eggshells. The list of vertebrates is also composed by the Neognathae Kookne yeutensis gen. et sp. nov., two isolated caudal vertebrae of Mammalia indet., and isolated teeth of a large mosasaur. Remains of fishes, anurans, turtles, and snakes are represented by fragmentary material of low taxonomical value, with the exception of remains belonging to Calyptocephalellidae. On the other hand, a remarkable diversity of terrestrial and freshwater gastropods has been documented, as well as fossil woods and palinological assemblages. The Chorrillo Formation continues south, in the Las Chinas River valley, southern Chile, where it is called Dorotea Formation. Both units share in their lower two thirds abundant materials of titanosaurs, whose remains cease to appear in the upper third, registering only elasmarians (Chorrillo Formation) and hadrosaurs (Dorotea Formation). Above both units there are levels with remains of invertebrates and marine reptiles. It is striking that the dinosaurs of the lower two thirds of the Chorrillo and Dorotea formations are represented by large basal titanosaurs and Megaraptoridae coelurosaurs, being the Saltasaurinae and Aeolosaurinae sauropods and Abelisauridae theropods totally absent. In contrast, these taxa are dominant components in sedimentary units of central and northern Patagonia (e.g., Allen, Los Alamitos, La Colonia formations). Such differences could reflect, in part, a greater antiquity (i.e., late Campanian-early Maastrichtian) for the Chorrillo fossils, or, more probably, different environmental conditions. Thus, knowledge of the biota of the southern tip of Patagonia is expanded, particularly those temporarily close to the K-Pg boundary.
第一个脊椎动物、无脊椎动物、植物和Chorrillo地层(南盆地)的化石遗迹，距离El Calafate镇(圣克鲁斯省)西南约30公里。化石包括elasmarian(基禽龙目)Isasicursor santacrucensis gen. et sp. nov.，大型泰坦巨龙Nullotitan glaciaris gen. et sp. nov.，大型和小型巨龙目。以及蜥脚类和兽脚类恐龙的蛋壳碎片。脊椎动物名单也由Neognathae Kookne yeutensis gen. et sp. nov.组成，这是哺乳纲indet的两个独立的尾椎骨。以及一只大型沧龙的牙齿。鱼类、无尾动物、龟类和蛇类的遗存中，除了萼头动物科的遗存外，其余都是分类价值较低的碎片材料。另一方面，陆生和淡水腹足动物的显著多样性已被记录下来，以及化石森林和古生物学组合。Chorrillo地层继续向南延伸，在智利南部的Las Chinas河谷，在那里它被称为Dorotea地层。这两个单位在其下三分之二处都有大量的泰坦龙化石，而在上半部分则没有发现泰坦龙的化石，只发现了弹性龙(Chorrillo组)和鸭嘴龙(Dorotea组)。在这两个单元之上，有一层是无脊椎动物和海洋爬行动物的遗骸。令人惊讶的是，在Chorrillo和Dorotea地层的下三分之二的恐龙以大型基底泰坦龙和巨掌龙为代表，而Saltasaurinae和Aeolosaurinae蜥脚类恐龙和Abelisauridae蜥脚类恐龙却完全没有。相反，这些分类群是巴塔哥尼亚中部和北部沉积单元(如Allen组、Los Alamitos组、La Colonia组)的主要组成部分。这种差异可能部分反映了Chorrillo化石的年代更久远(即坎帕尼亚晚期-马斯特里赫特早期)，或者更有可能是不同的环境条件。因此，对巴塔哥尼亚南端生物群的认识得到了扩展，特别是那些暂时靠近K-Pg边界的生物群。
{"title":"Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina","authors":"F. Novas, F. Agnolín, S. Rozadilla, A. Aranciaga-Rolando, Federico Brissón-Eli, M. J. Motta, M. A. Cerroni, M. Ezcurra, A. Martinelli, Julia D´Angelo, Gerardo P. Álvarez-Herrera, Adriel R Gentil, S. Bogan, N. Chimento, Jordi A. Garcia-Marsà, G. E. L. Coco, S. Miquel, F. Brito, E. Vera, V. P. Loinaze, M. S. Fernández, L. Salgado","doi":"10.22179/revmacn.21.655","DOIUrl":"https://doi.org/10.22179/revmacn.21.655","url":null,"abstract":"The first fossil remains of vertebrates, invertebrates, plants and palynomorphs of the Chorrillo Formation (Austral Basin), about 30km to the SW of the town of El Calafate (Province of Santa Cruz), are described. Fossils include the elasmarian (basal Iguanodontia) Isasicursor santacrucensis gen. et sp. nov., the large titanosaur Nullotitan glaciaris gen. et sp. nov., both large and small Megaraptoridae indet., and fragments of sauropod and theropod eggshells. The list of vertebrates is also composed by the Neognathae Kookne yeutensis gen. et sp. nov., two isolated caudal vertebrae of Mammalia indet., and isolated teeth of a large mosasaur. Remains of fishes, anurans, turtles, and snakes are represented by fragmentary material of low taxonomical value, with the exception of remains belonging to Calyptocephalellidae. On the other hand, a remarkable diversity of terrestrial and freshwater gastropods has been documented, as well as fossil woods and palinological assemblages. The Chorrillo Formation continues south, in the Las Chinas River valley, southern Chile, where it is called Dorotea Formation. Both units share in their lower two thirds abundant materials of titanosaurs, whose remains cease to appear in the upper third, registering only elasmarians (Chorrillo Formation) and hadrosaurs (Dorotea Formation). Above both units there are levels with remains of invertebrates and marine reptiles. It is striking that the dinosaurs of the lower two thirds of the Chorrillo and Dorotea formations are represented by large basal titanosaurs and Megaraptoridae coelurosaurs, being the Saltasaurinae and Aeolosaurinae sauropods and Abelisauridae theropods totally absent. In contrast, these taxa are dominant components in sedimentary units of central and northern Patagonia (e.g., Allen, Los Alamitos, La Colonia formations). Such differences could reflect, in part, a greater antiquity (i.e., late Campanian-early Maastrichtian) for the Chorrillo fossils, or, more probably, different environmental conditions. Thus, knowledge of the biota of the southern tip of Patagonia is expanded, particularly those temporarily close to the K-Pg boundary.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44442696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. D. Rubio, M. Nadal, J. E. Baigorria, L. Oklander, G. B. Edwards
Wedoquella apnnea sp. nov. and W. karadya sp. nov., two new species of the jumping spider subtribe Freyina are described and illustrated from specimens recently collected in Misiones and Chaco provinces, Northeastern Argentina. The new species are placed into a new group of Wedoquella because, although in body morphology they resemble the Phiale gratiosa group, the genital structures of both sexes more closely resemble those of Wedoquella, and a preliminary analysis based on mitochondrial COI sequences places this new group as sister to Wedoquella rather than to Phiale. Both new species are similar, but can be distinguished mainly by differences in the retrolateral tibial apophysis of the male palp. Females have a slight intraspecific color variation.
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