Pub Date : 2021-03-18DOI: 10.5710/1851-8044-58.1.72
Devapriya Chattopadhyay
{"title":"Actualistic Taphonomy in South America.","authors":"Devapriya Chattopadhyay","doi":"10.5710/1851-8044-58.1.72","DOIUrl":"https://doi.org/10.5710/1851-8044-58.1.72","url":null,"abstract":"","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"72 - 73"},"PeriodicalIF":1.0,"publicationDate":"2021-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43946508","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}
Pub Date : 2021-02-28DOI: 10.5710/AMGH.20.08.2020.3376
P. Gallina, J. Canale, J. Carballido
Abstract. The titanosaur sauropod record of Patagonia, mainly recovered from Upper Cretaceous strata, is probably the richest worldwide. Here we present a new sauropod dinosaur, Ninjatitan zapatai gen. et sp. nov., from the Lower Cretaceous Bajada Colorada Formation (Berriasian–Valanginian) of north Patagonia (Neuquén Province, Argentina), from which postcranial remains are preserved. The anatomical analysis and comparisons performed in this specimen evidence strong affinity with titanosaur sauropods. This assumption is corroborated with the inclusion of the new taxon in an updated phylogenetic data matrix. The cladistic analyses indicate that Ninjatitan could be considered the earliest known titanosaur sauropod. The combination of features such as the presence of procoelous anterior caudal centra, the pneumatized neural arch of anterior caudal vertebrae, and the posterodorsal border of the scapular acromion near the glenoid level supports its titanosaur affinities. The presence of a basal titanosaurian sauropod in the lowermost Cretaceous of Patagonia supports the hypothesis that the group was established in the Southern Hemisphere and reinforces the idea of a Gondwanan origin for Titanosauria. The Bajada Colorada sauropod fauna represents one of the most diverse and unique associations from the lowermost Cretaceous worldwide recorded.
{"title":"The Earliest Known Titanosaur Sauropod Dinosaur","authors":"P. Gallina, J. Canale, J. Carballido","doi":"10.5710/AMGH.20.08.2020.3376","DOIUrl":"https://doi.org/10.5710/AMGH.20.08.2020.3376","url":null,"abstract":"Abstract. The titanosaur sauropod record of Patagonia, mainly recovered from Upper Cretaceous strata, is probably the richest worldwide. Here we present a new sauropod dinosaur, Ninjatitan zapatai gen. et sp. nov., from the Lower Cretaceous Bajada Colorada Formation (Berriasian–Valanginian) of north Patagonia (Neuquén Province, Argentina), from which postcranial remains are preserved. The anatomical analysis and comparisons performed in this specimen evidence strong affinity with titanosaur sauropods. This assumption is corroborated with the inclusion of the new taxon in an updated phylogenetic data matrix. The cladistic analyses indicate that Ninjatitan could be considered the earliest known titanosaur sauropod. The combination of features such as the presence of procoelous anterior caudal centra, the pneumatized neural arch of anterior caudal vertebrae, and the posterodorsal border of the scapular acromion near the glenoid level supports its titanosaur affinities. The presence of a basal titanosaurian sauropod in the lowermost Cretaceous of Patagonia supports the hypothesis that the group was established in the Southern Hemisphere and reinforces the idea of a Gondwanan origin for Titanosauria. The Bajada Colorada sauropod fauna represents one of the most diverse and unique associations from the lowermost Cretaceous worldwide recorded.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"35 - 51"},"PeriodicalIF":1.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41429267","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}
Pub Date : 2021-02-28DOI: 10.5710/AMGH.27.11.2020.3353
Vanessa Torres-Carro, D. Garcia-Lopez, P. Ortiz
Abstract. The presence of fossil camelids in Tucumán, northwestern Argentina, has been recognized for many years but its relevance has not been fully evaluated so far. Here, we review previous mentions of fossil camelids for this province, present new material, and compare it with fossil and extant specimens of South American camelids, clarifying its taxonomic context and discussing its paleobiogeographic significance. For Tucumán we recognize Vicugna vicugna (Tafí del Valle Formation, late Pleistocene–early Holocene) and Palaeolama sp. (Tucumán Formation, late Pleistocene), mainly based on size and dental features. The current distribution of V. vicugna is restricted to the Central Andes, in the Puna and High Andean environments over 3200 m altitude; there is no mention, neither current nor historical, for Tucumán. Its presence at around 2200 m in the Tafí valley during the Quaternary indicates cooler and drier conditions than those currently established. The observations made in the context of this contribution allow us to establish that the species V. provicugna is a synonym of V. vicugna. In turn, we consider that the validity of the species Palaeolama hoffstetteri, only based on postcranial remains, should be properly evaluated in the future.
摘要在阿根廷西北部Tucumán发现骆驼类化石已经有很多年了，但是它的相关性到目前为止还没有得到充分的评估。在此，我们回顾了前人对本省骆驼类化石的报道，提出了新的材料，并将其与化石和现存的南美骆驼类标本进行了比较，澄清了其分类背景，讨论了其古生物地理意义。对于Tucumán，我们主要根据大小和牙齿特征识别Vicugna Vicugna (Tafí del Valle组，晚更新世-全新世早期)和Palaeolama sp. (Tucumán组，晚更新世)。骆马目前的分布局限于安第斯山脉中部、海拔3200米以上的普纳和高安第斯山脉环境;无论是现在还是过去，都没有提到Tucumán。在第四纪期间，它在Tafí山谷2200米左右的位置存在，表明条件比目前确定的更冷和更干燥。在这一贡献的背景下所作的观察使我们能够确定，物种V. provicugna是V. vicugna的同义词。因此，我们认为，仅基于颅后遗骨，应该在未来适当地评估该物种的有效性。
{"title":"The Fossil Record of Camelids (Mammalia, Cetartiodactyla) in Tucumán Province, Northwestern Argentina","authors":"Vanessa Torres-Carro, D. Garcia-Lopez, P. Ortiz","doi":"10.5710/AMGH.27.11.2020.3353","DOIUrl":"https://doi.org/10.5710/AMGH.27.11.2020.3353","url":null,"abstract":"Abstract. The presence of fossil camelids in Tucumán, northwestern Argentina, has been recognized for many years but its relevance has not been fully evaluated so far. Here, we review previous mentions of fossil camelids for this province, present new material, and compare it with fossil and extant specimens of South American camelids, clarifying its taxonomic context and discussing its paleobiogeographic significance. For Tucumán we recognize Vicugna vicugna (Tafí del Valle Formation, late Pleistocene–early Holocene) and Palaeolama sp. (Tucumán Formation, late Pleistocene), mainly based on size and dental features. The current distribution of V. vicugna is restricted to the Central Andes, in the Puna and High Andean environments over 3200 m altitude; there is no mention, neither current nor historical, for Tucumán. Its presence at around 2200 m in the Tafí valley during the Quaternary indicates cooler and drier conditions than those currently established. The observations made in the context of this contribution allow us to establish that the species V. provicugna is a synonym of V. vicugna. In turn, we consider that the validity of the species Palaeolama hoffstetteri, only based on postcranial remains, should be properly evaluated in the future.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"52 - 60"},"PeriodicalIF":1.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41827634","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}
Pub Date : 2021-02-28DOI: 10.5710/AMGH.28.09.2020.3355
Johana A. Fernández
Abstract. Botrychiopsis is an important biostratigraphic index taxon for Carboniferous–early Permian plant fossil successions of Gondwana. Its species have wide geographic distributions, restricted chronostratigraphic ranges, and are associated with diverse groups of plant associations. They have been described from sedimentary sequences of Australia, India, South Africa, Brazil, and Argentina. A whole-frond reconstruction of Botrychiopsis plantiana is presented based on a study of very well preserved specimens from the Gangamopteris flora (Ghzelian–Asselian) of the Bajo de Véliz Formation (Paganzo Basin, Argentina). The material consists of impressions of complete fronds and basal fragments, which are rarely represented in the Gondwanan upper Paleozoic fossil record.
摘要芽孢藓是冈瓦纳石炭纪-早二叠世植物化石演替的重要生物地层指标分类群。其物种地理分布广泛，年代地层范围有限，并与多种植物类群相关联。它们在澳大利亚、印度、南非、巴西和阿根廷的沉积序列中被描述过。基于对阿根廷Paganzo盆地Bajo de vsamuliz地层Gangamopteris植物区系(Ghzelian-Asselian)保存完好的标本的研究，提出了plantiana Botrychiopsis的整体重建。材料由完整的叶状印痕和基底碎片组成，这在冈瓦南上古生界化石记录中是罕见的。
{"title":"Revision of Botrychiopsis plantiana: A Key Species of the Gzhelian–Cisuralian in Westernmost Gondwana","authors":"Johana A. Fernández","doi":"10.5710/AMGH.28.09.2020.3355","DOIUrl":"https://doi.org/10.5710/AMGH.28.09.2020.3355","url":null,"abstract":"Abstract. Botrychiopsis is an important biostratigraphic index taxon for Carboniferous–early Permian plant fossil successions of Gondwana. Its species have wide geographic distributions, restricted chronostratigraphic ranges, and are associated with diverse groups of plant associations. They have been described from sedimentary sequences of Australia, India, South Africa, Brazil, and Argentina. A whole-frond reconstruction of Botrychiopsis plantiana is presented based on a study of very well preserved specimens from the Gangamopteris flora (Ghzelian–Asselian) of the Bajo de Véliz Formation (Paganzo Basin, Argentina). The material consists of impressions of complete fronds and basal fragments, which are rarely represented in the Gondwanan upper Paleozoic fossil record.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"1 - 11"},"PeriodicalIF":1.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45337688","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}
Pub Date : 2021-02-28DOI: 10.5710/AMGH.01.09.2020.3371
Germán Barmak, L. Chornogubsky, L. Gaetano
This work describes two new materials corresponding to Pachybiotherium illuminatum, a microbiotheriid from Pinturas Formation (early Miocene, Santa Cruz Province, Argentina) previously reported at the lower levels of the Formation on Portezuelo Sumich Sur, now recorded in lower levels of Portezuelo Sumich Norte and the possibly upper levels of Los Toldos Sur localities. The new specimens offer a better understanding of P. illuminatum upper molars morphology and, if the level assignation was correct, allow us to argue that 1) P. illuminatum is reported for the first time as appearing on a typical Santacrucian fauna; 2) the “Pinturan” and Santacrucian faunas at the Rio Pinturas localities are more similar than previously reported; 3) the biochron of the species is extended.
这项工作描述了两种与Pachybiotherium illuminum相对应的新材料，Pachybiotherium illuminum是一种来自Pinturas组（中新世早期，阿根廷圣克鲁斯省）的微生物群系，以前在南苏密赫港的低层地层中报道过，现在在北苏密赫门的低层和可能的南洛斯托多斯地区的高层地层中记录过。这些新标本更好地了解了发光乳杆菌上臼齿的形态，如果水平分配正确，我们可以认为：1）发光乳杆菌首次被报道出现在典型的圣诞老人动物群中；2） Rio Pinturas地区的“Pinturan”和Santacracian动物群比之前报道的更相似；3） 该物种的生物芯片得到扩展。
{"title":"New Insights on Pachybiotherium illuminatum(Mammalia, Marsupialia, Microbiotheriidae) from the Early Miocene of the Pinturas Formation (Santa Cruz Province, Argentina)","authors":"Germán Barmak, L. Chornogubsky, L. Gaetano","doi":"10.5710/AMGH.01.09.2020.3371","DOIUrl":"https://doi.org/10.5710/AMGH.01.09.2020.3371","url":null,"abstract":"This work describes two new materials corresponding to Pachybiotherium illuminatum, a microbiotheriid from Pinturas Formation (early Miocene, Santa Cruz Province, Argentina) previously reported at the lower levels of the Formation on Portezuelo Sumich Sur, now recorded in lower levels of Portezuelo Sumich Norte and the possibly upper levels of Los Toldos Sur localities. The new specimens offer a better understanding of P. illuminatum upper molars morphology and, if the level assignation was correct, allow us to argue that 1) P. illuminatum is reported for the first time as appearing on a typical Santacrucian fauna; 2) the “Pinturan” and Santacrucian faunas at the Rio Pinturas localities are more similar than previously reported; 3) the biochron of the species is extended.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"66 - 71"},"PeriodicalIF":1.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48643569","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}
Pub Date : 2021-02-28DOI: 10.5710/AMGH.26.06.2020.3354
D. Fernández, P. Martínez, L. Palazzesi, V. Barreda
{"title":"Mites (Acari, Oribatida, Nanhermannidae) from the Eocene of Patagonia: First Southern Hemisphere Fossil Record in Marine Sediments","authors":"D. Fernández, P. Martínez, L. Palazzesi, V. Barreda","doi":"10.5710/AMGH.26.06.2020.3354","DOIUrl":"https://doi.org/10.5710/AMGH.26.06.2020.3354","url":null,"abstract":"","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"61 - 65"},"PeriodicalIF":1.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43179103","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}
Pub Date : 2021-01-07DOI: 10.5710/1851-8044-57.6.625
G. Hassan
{"title":"Advances in South American Micropaleontology. Selected Papers of the 11th Argentine Paleontological Congress","authors":"G. Hassan","doi":"10.5710/1851-8044-57.6.625","DOIUrl":"https://doi.org/10.5710/1851-8044-57.6.625","url":null,"abstract":"","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"57 1","pages":"625 - 626"},"PeriodicalIF":1.0,"publicationDate":"2021-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41680168","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}
Pub Date : 2020-12-18DOI: 10.5710/AMGH.30.07.2020.3368
R. Vezzosi, A. Rotti, Leonardo Dos Santos Avilla
Here it is reviewed the specimen MACN-Pv 12630, the cotype of the ground-sloth Nothrophus cararanensis Bordas, 1942, and proposed that it should be taxonomically relocated to the extinct deer Morenelaphus. The specimen in question is represented by a fragmentary braincase, that shares several features with Cervidae and, more detailed with Morenelaphus. Besides antler morphology, this contribution shows that basicranium attributes are also very important to elucidate taxonomical affinities within South American Cervidae.
{"title":"‘A Very Lazy Deer': Revision of the Cotype Of Nothropus carcaranensis (Mammalia, Xenarthra)","authors":"R. Vezzosi, A. Rotti, Leonardo Dos Santos Avilla","doi":"10.5710/AMGH.30.07.2020.3368","DOIUrl":"https://doi.org/10.5710/AMGH.30.07.2020.3368","url":null,"abstract":"Here it is reviewed the specimen MACN-Pv 12630, the cotype of the ground-sloth Nothrophus cararanensis Bordas, 1942, and proposed that it should be taxonomically relocated to the extinct deer Morenelaphus. The specimen in question is represented by a fragmentary braincase, that shares several features with Cervidae and, more detailed with Morenelaphus. Besides antler morphology, this contribution shows that basicranium attributes are also very important to elucidate taxonomical affinities within South American Cervidae.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"57 1","pages":"616 - 622"},"PeriodicalIF":1.0,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42576599","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}
Pub Date : 2020-12-18DOI: 10.5710/1851-8044-57.6.623
A. Mancuso
{"title":"The Late Triassic World. Earth in a Time of Transition","authors":"A. Mancuso","doi":"10.5710/1851-8044-57.6.623","DOIUrl":"https://doi.org/10.5710/1851-8044-57.6.623","url":null,"abstract":"","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"57 1","pages":"623 - 624"},"PeriodicalIF":1.0,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45528013","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}
Pub Date : 2020-12-18DOI: 10.5710/AMGH.23.06.2020.3333
M. E. P. Batista, L. Kunzmann, A. Sá, A. Saraiva, M. I. Loiola
Abstract. The Araripe Basin, located in the Northeast of Brazil, contains many fossils. Among these, the gymnosperms stand out, especially species of the fossil taxon Brachyphyllum. It encompasses conifer shoots with helically arranged scale-like, adpressed leaves whose length does not exceed the width. This foliage morphotype was widely distributed during the Mesozoic, and species accommodated in this genus can be attributed to different families if their anatomical characters are taken into consideration. In the Araripe basin, specifically in the Crato and Romualdo formations, Brachyphyllum obesum is frequently found and was attributed to the family Araucariaceae based on leaf epidermal and xylem characters. In this work, we describe a new species from the Crato Formation (Lower Cretaceous), Brachyphyllum sattlerae sp. nov., based on the following morphological and anatomical features: sub-main shoots with lateral branches oppositely disposed and almost exclusively decussately arranged leaves; scarious leaf margins; rugose abaxial leaf surfaces; non-papillate epidermal cells; stomata distributed in longitudinal rows except close to the leaf margins and scarce at the leaf base; stomatal openings obliquely oriented; and hypodermis with a sinuous pattern around the substomatal chamber. Some of these features are distinctive of Araucariaceae, which indicates that B. sattlerae sp. nov. also belongs to this family.
{"title":"A New Species of Brachyphyllum from the Crato Formation (Lower Cretaceous), Araripe Basin, Brazil","authors":"M. E. P. Batista, L. Kunzmann, A. Sá, A. Saraiva, M. I. Loiola","doi":"10.5710/AMGH.23.06.2020.3333","DOIUrl":"https://doi.org/10.5710/AMGH.23.06.2020.3333","url":null,"abstract":"Abstract. The Araripe Basin, located in the Northeast of Brazil, contains many fossils. Among these, the gymnosperms stand out, especially species of the fossil taxon Brachyphyllum. It encompasses conifer shoots with helically arranged scale-like, adpressed leaves whose length does not exceed the width. This foliage morphotype was widely distributed during the Mesozoic, and species accommodated in this genus can be attributed to different families if their anatomical characters are taken into consideration. In the Araripe basin, specifically in the Crato and Romualdo formations, Brachyphyllum obesum is frequently found and was attributed to the family Araucariaceae based on leaf epidermal and xylem characters. In this work, we describe a new species from the Crato Formation (Lower Cretaceous), Brachyphyllum sattlerae sp. nov., based on the following morphological and anatomical features: sub-main shoots with lateral branches oppositely disposed and almost exclusively decussately arranged leaves; scarious leaf margins; rugose abaxial leaf surfaces; non-papillate epidermal cells; stomata distributed in longitudinal rows except close to the leaf margins and scarce at the leaf base; stomatal openings obliquely oriented; and hypodermis with a sinuous pattern around the substomatal chamber. Some of these features are distinctive of Araucariaceae, which indicates that B. sattlerae sp. nov. also belongs to this family.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"57 1","pages":"519 - 533"},"PeriodicalIF":1.0,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46164498","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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