Around one hundred specimens of fossil leaves are described herein and referred to 6 fossil-species and two taxonomic units of Nothofagaceae from the Paleogene Rio Turbio Formation, Santa Cruz Province, Argentina. These are: Nothofagus simplicidens , Nothofagus variabilis , Nothofagus lanceolata , Nothofagus subferruginea , Nothofagus dicksoni , Nothofagus sp. with Nothofagus cf. obliqua and Nothofagus magelhaenica reported for the first time for the unit. They were recorded throughout the unit, but they are fairly more abundant in the upper member of the Rio Turbio Formation where they reach the 68% of the overall assemblage. The observed increasing trend in Nothofagus abundance throughout the unit coincides with the beginning of the flora turnover that characterized Patagonian ecosystems from the Late Eocene onwards and it is in agreement with the marked global cooling trend of the terminal Paleogene.
{"title":"Southern beech (Nothofagaceae) fossil leaves from the Río Turbio Formation (Eocene–?Oligocene), Santa Cruz Province, Argentina.","authors":"C. Panti","doi":"10.22179/REVMACN.21.626","DOIUrl":"https://doi.org/10.22179/REVMACN.21.626","url":null,"abstract":"Around one hundred specimens of fossil leaves are described herein and referred to 6 fossil-species and two taxonomic units of Nothofagaceae from the Paleogene Rio Turbio Formation, Santa Cruz Province, Argentina. These are: Nothofagus simplicidens , Nothofagus variabilis , Nothofagus lanceolata , Nothofagus subferruginea , Nothofagus dicksoni , Nothofagus sp. with Nothofagus cf. obliqua and Nothofagus magelhaenica reported for the first time for the unit. They were recorded throughout the unit, but they are fairly more abundant in the upper member of the Rio Turbio Formation where they reach the 68% of the overall assemblage. The observed increasing trend in Nothofagus abundance throughout the unit coincides with the beginning of the flora turnover that characterized Patagonian ecosystems from the Late Eocene onwards and it is in agreement with the marked global cooling trend of the terminal Paleogene.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42831231","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}
S. M. Martin, V. Núñez, D. E. G. Gregoric, A. Rumi
Abstract We studied freshwater snails inhabiting an urban pond in an enclosed private community from the northern Province of Buenos Aires, Argentina for a year and monitored individuals in order to observe parasite emergence. Specimens of the predominant snail species were measured and analyzed histologically to examine possible larval effects on the gonadal tissue causing alterations in the developmental stages of the gonads and the degree of parasite prevalence per age, sex, and host size calculated. Four species were registered: Pomacea canaliculata , Physa acuta , Biomphalaria peregrina and Heleobia parchappii. The last of these was the most abundant, whose breeding season was in the spring. The parasitized snails exhibited a shorter average length than those free of parasites. The larval prevalence increased with host length, becoming the highest in postreproductive-stage individuals, but was not different between the sexes. Among the emerged cercariae, we noted a marked predominance of the family Notocotylidae. Resumen Las lagunas urbanas como un riesgo potencial en la transmision de parasitos Se estudiaron durante un ano los gasteropodos de agua dulce que habitan en una laguna artificial urbana en un barrio privado del nordeste de la provincia de Buenos Aires, Argentina. Se monitorearon individuos para observar la emergencia de parasitos. Los individuos de las especies de caracoles predominantes se midieron y se analizaron histologicamente para examinar los posibles efectos de larvas en el tejido gonadal, el grado de prevalencia de parasitos por tamano y sexo. Se registraron cuatro especies de gasteropodos: Pomacea canaliculata, Physa acuta, Biomphalaria peregrina y Heleobia parchappii. La ultima de estas especie fue la mas abundante, registrando eventos reproductivos en primavera. Los caracoles parasitados exhibieron una longitud promedio mas baja que aquellos libres de parasitos. La prevalencia de larvas aumento con la longitud del hospedador, llegando a ser la mas alta en individuos en etapa postreproductiva, pero no fue diferente entre los sexos. Entre las cercarias emergentes, notamos un marcado predominio de la familia Notocotylidae
在阿根廷布宜诺斯艾利斯省北部一个封闭的私人社区，我们对生活在城市池塘中的淡水蜗牛进行了一年的研究，并对个体进行了监测，以观察寄生虫的出现情况。对优势螺种的标本进行了测量和组织学分析，以检查幼虫对性腺组织的可能影响，从而导致性腺发育阶段的改变，并计算了按年龄、性别和寄主大小计算的寄生虫流行程度。记录到4种:小管Pomacea canaliculata、尖泡Physa acuta、滨带Biomphalaria peregrina和海参Heleobia parchappii。最后一种是数量最多的，繁殖季节在春天。被寄生的蜗牛比未被寄生的蜗牛平均体长短。幼虫流行率随寄主长度的增加而增加，以产卵后期个体最高，但两性间无差异。在出现的尾蚴中，我们注意到notocotydae家族的明显优势。阿根廷布宜诺斯艾利斯省北部私有城市的潜在寄生虫传播研究。阿根廷布宜诺斯艾利斯北部私有城市的潜在寄生虫传播研究。根据寄生虫紧急情况对个人进行监测。通过组织学分析、辅助检查、对幼虫的可能影响、对性腺的可能影响、对寄生虫的可能影响、对性腺的可能影响、对性腺的可能影响、对性腺的可能影响。龟足动物的记录种:小管Pomacea canaliculata, Physa actuuta, Biomphalaria peregrina和Heleobia parchappii。“最后的机会，特别是最丰富的机会，登记和事件，生殖和初级”。寄生虫的纵向展览:寄生虫的纵向展览:寄生虫的纵向展览。La prevalencia de larvas aumento con La经度del hospedador, legando和ser在个体之间的差异，包括生殖生产力，以及不同的中心性别。紧急尾蚴病中心，而不是蚊子叶科的主要疾病中心
{"title":"The urban ponds as a potential risk in the transmission of parasites","authors":"S. M. Martin, V. Núñez, D. E. G. Gregoric, A. Rumi","doi":"10.22179/REVMACN.21.609","DOIUrl":"https://doi.org/10.22179/REVMACN.21.609","url":null,"abstract":"Abstract We studied freshwater snails inhabiting an urban pond in an enclosed private community from the northern Province of Buenos Aires, Argentina for a year and monitored individuals in order to observe parasite emergence. Specimens of the predominant snail species were measured and analyzed histologically to examine possible larval effects on the gonadal tissue causing alterations in the developmental stages of the gonads and the degree of parasite prevalence per age, sex, and host size calculated. Four species were registered: Pomacea canaliculata , Physa acuta , Biomphalaria peregrina and Heleobia parchappii. The last of these was the most abundant, whose breeding season was in the spring. The parasitized snails exhibited a shorter average length than those free of parasites. The larval prevalence increased with host length, becoming the highest in postreproductive-stage individuals, but was not different between the sexes. Among the emerged cercariae, we noted a marked predominance of the family Notocotylidae. Resumen Las lagunas urbanas como un riesgo potencial en la transmision de parasitos Se estudiaron durante un ano los gasteropodos de agua dulce que habitan en una laguna artificial urbana en un barrio privado del nordeste de la provincia de Buenos Aires, Argentina. Se monitorearon individuos para observar la emergencia de parasitos. Los individuos de las especies de caracoles predominantes se midieron y se analizaron histologicamente para examinar los posibles efectos de larvas en el tejido gonadal, el grado de prevalencia de parasitos por tamano y sexo. Se registraron cuatro especies de gasteropodos: Pomacea canaliculata, Physa acuta, Biomphalaria peregrina y Heleobia parchappii. La ultima de estas especie fue la mas abundante, registrando eventos reproductivos en primavera. Los caracoles parasitados exhibieron una longitud promedio mas baja que aquellos libres de parasitos. La prevalencia de larvas aumento con la longitud del hospedador, llegando a ser la mas alta en individuos en etapa postreproductiva, pero no fue diferente entre los sexos. Entre las cercarias emergentes, notamos un marcado predominio de la familia Notocotylidae","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44696497","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}
The first cases of anomalies in the number of shell-plates in Tonicia atrata (Sowerby II, 1840) are herein reported on the basis of three specimens from Zaratiegui Bay, Tierra del Fuego, Argentina (54°50’53’’ S, 68°29’7’’ W): two cases of coalescence (one symmetrical and another one asymmetrical) and a case of hypomerism. The abnormal specimens bore less ctenidia than physiological conspecific specimens of similar size. The symmetrical coalescent specimen and the hypomeric individual were significantly wider (higher width/length ratio) than physiological specimens. Nevertheless, the reported abnormalities seem to have no effect on general growth, since the body size of the abnormal specimens were close to the largest physiological ones found in the same locality.
{"title":"First records of coalescence and hypomerism in Tonicia atrata (Polyplacophora, Chitonidae) in the Southwestern Atlantic Ocean","authors":"C. Guillén, D. Urteaga","doi":"10.22179/REVMACN.21.610","DOIUrl":"https://doi.org/10.22179/REVMACN.21.610","url":null,"abstract":"The first cases of anomalies in the number of shell-plates in Tonicia atrata (Sowerby II, 1840) are herein reported on the basis of three specimens from Zaratiegui Bay, Tierra del Fuego, Argentina (54°50’53’’ S, 68°29’7’’ W): two cases of coalescence (one symmetrical and another one asymmetrical) and a case of hypomerism. The abnormal specimens bore less ctenidia than physiological conspecific specimens of similar size. The symmetrical coalescent specimen and the hypomeric individual were significantly wider (higher width/length ratio) than physiological specimens. Nevertheless, the reported abnormalities seem to have no effect on general growth, since the body size of the abnormal specimens were close to the largest physiological ones found in the same locality.","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44161390","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}
A. Ojanguren-Affilastro, Cristian Bizzoto, L. Lanari, Mariana Remes Lenicov, A. Roodt
{"title":"The Presence of Tityus confluens Borelli in Buenos Aires city and the expansion of the distribution of the medically important species of Tityus (Scorpiones; Buthidae) in Argentina","authors":"A. Ojanguren-Affilastro, Cristian Bizzoto, L. Lanari, Mariana Remes Lenicov, A. Roodt","doi":"10.22179/REVMACN.21.638","DOIUrl":"https://doi.org/10.22179/REVMACN.21.638","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68257043","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":"New species of Euspilotus Lewis of Argentina (Coleoptera: Histeridae)","authors":"Gerardo Arriagada, F. Jofré, F. Aballay","doi":"10.22179/REVMACN.21.602","DOIUrl":"https://doi.org/10.22179/REVMACN.21.602","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68256248","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}
Valeria Bauni, S. Bogan, Juan Manuel Meluso, M. Homberg, Adrián Giacchino
{"title":"First inventory of vertebrates in the private natural reserve El Morejon, Campana, Buenos Aires province","authors":"Valeria Bauni, S. Bogan, Juan Manuel Meluso, M. Homberg, Adrián Giacchino","doi":"10.22179/revmacn.21.646","DOIUrl":"https://doi.org/10.22179/revmacn.21.646","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68257056","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":"Reproduction and fat bodies cycle of Liolaemus espinozai Abdala, 2005 (Sauria: Liolaemidae) from Campo El Arenal, Catamarca, Argentina","authors":"María Paula Cabrera, G. Scrocchi","doi":"10.22179/revmacn.21.649","DOIUrl":"https://doi.org/10.22179/revmacn.21.649","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68257163","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":"Sexual dimorphism and trophic ecology of Aurivela tergolaevigata (Teiidae)","authors":"G. A. Gallardo, M. J. Tulli, Gustavo J. Sccrochi","doi":"10.22179/REVMACN.21.606","DOIUrl":"https://doi.org/10.22179/REVMACN.21.606","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68256262","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":"Biotic vs abiotic resistance: the case of urban spiders in Chile","authors":"A. Taucare-Ríos, A. Brescovit","doi":"10.22179/revmacn.21.622","DOIUrl":"https://doi.org/10.22179/revmacn.21.622","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68257028","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 talares of Zárate (Buenos Aires Province, Argentina). A history of losses and a committed future","authors":"E. L. Guerrero","doi":"10.22179/revmacn.21.616","DOIUrl":"https://doi.org/10.22179/revmacn.21.616","url":null,"abstract":"","PeriodicalId":39176,"journal":{"name":"Revista del Museo Argentino de Ciencias Naturales, Nueva Serie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68256905","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}
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