Ameghiniana最新文献_第8页

Biomechanical Skull Study of the Aetosaur Neoaetosauroides engaeus Using Finite Element Analysis 基于有限元分析的新翼龙颅骨生物力学研究

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-09-30 DOI: 10.5710/AMGH.23.07.2021.3412

Jeremías R. A. Taborda, J. Desojo, E. Dvorkin

{"title":"Biomechanical Skull Study of the Aetosaur Neoaetosauroides engaeus Using Finite Element Analysis","authors":"Jeremías R. A. Taborda, J. Desojo, E. Dvorkin","doi":"10.5710/AMGH.23.07.2021.3412","DOIUrl":"https://doi.org/10.5710/AMGH.23.07.2021.3412","url":null,"abstract":"Abstract. Aetosaurs are quadrupedal archosaurs that had a worldwide distribution during the Late Triassic. They had small heads relative to their body size and a long tail, and they are characterized by a dorsal and ventral carapace formed by ornamented and articulated osteoderms. Although aetosaurs historically have been considered the only herbivorous among the early pseudosuchian archosaurs, few analyses quantitatively assess their feeding habits, and some authors have proposed omnivorous and/or scavenging habits for the group. Neoaetosauroides engaeus is an aetosaur from the Late Triassic of the Los Colorados Formation, La Rioja, Argentina. N. engaeus is known from three relatively well-preserved skulls, making it an excellent taxon to study the feeding ecology. We applied the Finite Element Method to estimate bite force and to evaluate the structural response of the skull at different positions during food processing. Our results show that the skull of N. engaeus generated a bite force of 3.6 kN, a magnitude comparable with the measurement made in Alligator mississippiensis, and could resist lateral and longitudinal forces during feeding. This indicates that N. engaeus was capable of hunting of small living prey (e.g., cynodonts) with its jaws, and/or dragging carcasses of larger sizes (e.g., dicynodonts). These results bring new evidence that supports possible zoophagy or omnivory for N. engaeus, thus expanding the potential ecological roles of aetosaurs.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42626976","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}

引用次数: 4

Neogene Bony Fishes from the Bahía Inglesa Formation, Northern Chile 智利北部Bahía Inglesa组的新近纪硬骨鱼

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-08-31 DOI: 10.5710/AMGH.26.05.2021.3375

Pablo Oyanadel-Urbina, Carlos De Gracia, J. Carrillo-Briceño, S. Nielsen, H. Flores, Víctor Casteletto, J. Kriwet, M. Rivadeneira, Jaime A. Villafaña

{"title":"Neogene Bony Fishes from the Bahía Inglesa Formation, Northern Chile","authors":"Pablo Oyanadel-Urbina, Carlos De Gracia, J. Carrillo-Briceño, S. Nielsen, H. Flores, Víctor Casteletto, J. Kriwet, M. Rivadeneira, Jaime A. Villafaña","doi":"10.5710/AMGH.26.05.2021.3375","DOIUrl":"https://doi.org/10.5710/AMGH.26.05.2021.3375","url":null,"abstract":"Abstract. Despite being one of the richest Neogene deposits of marine fossil vertebrates along the Pacific coast of South America, no detailed study of bony fishes from the Bahía Inglesa Formation has been carried out. Through the revision of historical collections of the Caldera Paleontological Museum, we describe 27 fossil remains of bony fishes. Fossils described here are distributed in 13 taxa. Among these, Sardinops sp. cf. S. sagax (Clupeidae) represents the first fossil record of the genus for Chile, Labrodon sp. (Labridae) and Stelliferinae (Sciaenidae) are the first respective records for the southeast Pacific Ocean, Sarda sp. (Scombridae) represents the first fossil record for South America, Semicossyphus sp. (Labridae) and Anisotremus sp. (Haemulidae) are the first respective records for the Southern Hemisphere. Gymnosarda sp. (Scombridae) is described for the first time for the Neogene. We performed a paleobathymetric analysis of fossil fishes, including elasmobranchs, to understand the paleoenvironment followed by a similarity analysis that compares the faunal composition of the Bahía Inglesa Fm. with other fossil assemblages for the Pacific of South America. Our results show that the fish fauna from the Bahía Inglesa Fm. likely represents a depth range of 98 to 382 m with a mean depth range of 252 m in an uppermost bathyal environment. The assemblage from the Bahía Inglesa Fm. shows low taxonomic similarity levels with other Neogene geological units from the southeast Pacific Ocean. The study represents the first paleoecological and paleobiogeographic analysis of the fossil fish fauna from the Southeast Pacific.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45028030","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}

引用次数: 4

Upper Pennsylvanian Age of the Lower Talchir Formation in the Wardha Basin, Central India, Based on Guide Palynomorphs Present in Radiometrically-Dated Palynozonations in South America, Africa, and Australia 印度中部Wardha盆地下Talchir组的上宾夕法尼亚时代——基于南美洲、非洲和澳大利亚辐射定年孢粉带中的Guide孢粉形态

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-08-31 DOI: 10.5710/AMGH.29.03.2021.3423

P. S. Kavali, A. Roy, M. Pasquo, G. P. Gurumurthy, Gaurav Sharma, Ajit Kumar

{"title":"Upper Pennsylvanian Age of the Lower Talchir Formation in the Wardha Basin, Central India, Based on Guide Palynomorphs Present in Radiometrically-Dated Palynozonations in South America, Africa, and Australia","authors":"P. S. Kavali, A. Roy, M. Pasquo, G. P. Gurumurthy, Gaurav Sharma, Ajit Kumar","doi":"10.5710/AMGH.29.03.2021.3423","DOIUrl":"https://doi.org/10.5710/AMGH.29.03.2021.3423","url":null,"abstract":"Abstract. The age of the Talchir Formation corresponding to the lower part of the Gondwana (Permo–Carboniferous) Sequence in India is revised in the light of palynostratigraphic data associated with radiometric dating generated in Gondwana. New data was generated from seven samples of the Talchir Formation obtained from Well 131, located in the Penganga area of Wardha Valley Coalfield (Maharashtra State, central India). Two assemblages were demarcated based on the stratigraphic distribution of 63 species of spores (23 taxa), pollen grains (35 taxa), and phytoplankton. Palynoassociation I recognized in the two basal samples yielded few Punctatisporites spores and monosaccate pollen grains. Palynoassociation II is demarcated in the overlying three samples characterized by spores and pollen grains that are more diversified and abundant than in the other two samples. Several taxa (Concavissimisporites grumulus, Converrucosisporites confluens, Cyclogranisporites gondwanensis, Verrucosisporites andersonii, Latusipollenites quadrisaccatus, Marsupipollenites striatus, Pakhapites fusus, Striatoabieites multistriatus, Vittatina subsaccata, Vittatina vittifera) are shared with palynozones radiometrically constrained to the latest Pennsylvanian–early Cisuralian in Argentina, Brazil, Africa, and Australia. Therefore, we propose a Kasimovian to Ghezelian–Asselian age for the palynoassociations I and II of the Talchir Formation and a correlation with the Potonieisporites neglectus and Plicatipollenites gondwanensis Zones of Tiwari & Tripathi, respectively. This approach significantly improves the stratigraphic correlations of the Indian palynozones in Gondwana.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45903468","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}

引用次数: 3

Forward to the Past: A Romp through the Nature of the Last Half-Billion Years 展望过去:在过去5亿年的自然中嬉戏

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-08-31 DOI: 10.5710/1851-8044-58.4.376

A. Tomescu, Allison W. Bronson

引用次数: 0

Palynology of the Early to Middle Devonian Pescado Formation, Subandean Range, Salta Province, Argentina 阿根廷萨尔塔省Subandean Range早至中泥盆世Pescado组孢粉学

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-08-31 DOI: 10.5710/AMGH.25.05.2021.3413

J. Pineda, S. Noetinger, E. Ottone

{"title":"Palynology of the Early to Middle Devonian Pescado Formation, Subandean Range, Salta Province, Argentina","authors":"J. Pineda, S. Noetinger, E. Ottone","doi":"10.5710/AMGH.25.05.2021.3413","DOIUrl":"https://doi.org/10.5710/AMGH.25.05.2021.3413","url":null,"abstract":"Abstract. We present the palynoflora recovered from the Pescado Formation in the Subandean Range, Salta Province, Argentina. The palynological assemblage comprises well-preserved marine and terrestrial palynomorphs, including cryptospores (one species), trilete spores (16 species), acritarchs (six species), prasinophytes (three species), and chlorophytes (three species). Based on the quantitative analysis and stratigraphic distribution of palynomorphs, two palynological associations are recognized (RC1, RC2). The presence of Dictyotriletes emsiensis morphon and Acinosporites apiculatus, together with Duvernaysphaera angelae and D. tenuicingulata, suggests a late Emsian–Eifelian age for RC1 and RC2. The studied assemblages contain many taxa in common with other coeval assemblages of Gondwana that confirm the paleogeographical relationships among the Argentine Precordillera, the Tarija Basin, and the southern Chacoparaná Basin in Uruguay. The relative abundance of the palynomorphs encountered suggests a marine depositional environment close to the paleo-shoreline for the RC1, and a more distal marine setting for the RC2, possibly nearshore, reflecting the Eifelian transgression. This event, already documented by different authors, is also recognized in the southern portion of the Tarija Basin.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43989198","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}

引用次数: 1

New Record of a Phocid (Mammalia, Carnivora, Phocidae) in the Late Miocene of Patagonia, Argentina 阿根廷巴塔哥尼亚晚中新世一phocida(哺乳目，食肉目，Phocidae)新记录

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-08-31 DOI: 10.5710/AMGH.04.06.2021.3403

Sebastián Echarri, D. Pérez, Marcelo Miñana, Sergio O. Lucero

引用次数: 2

The Evolution and Fossil Record of Parasitism. Identification and Macroevolution of Parasites 寄生的进化和化石记录。寄生虫的鉴定与宏观进化

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-07-14 DOI: 10.5710/1851-8044-58.3.299

K. Baets, J. Huntley

引用次数: 1

Biological Consequences of Plate Tectonics: New Perspectives on Post-Gondwana Break-Up—A Tribute to Ashok Sahni 板块构造的生物学后果:冈瓦纳板块分裂后的新视角——致Ashok Sahni

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-07-14 DOI: 10.5710/1851-8044-58.3.297

F. Abdala

引用次数: 0

Palaeomohria Spores from the Cenomanian in Patagonia, Argentina 阿根廷巴塔哥尼亚Cenomanian的古莫氏菌孢子

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-06-30 DOI: 10.5710/AMGH.22.02.2021.3407

P. Santamarina, V. Barreda, A. Iglesias, A. Varela

引用次数: 2

A New Basal Notoungulate from the Itaboraí Basin (Paleogene) of Brazil 巴西Itaboraí盆地(古近系)一种新的基底无蹄类

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-06-30 DOI: 10.5710/AMGH.05.02.2021.3387

Luis Otavio Rezende Castro, D. Garcia-Lopez, L. Bergqvist, H. I. de Araújo‐Júnior

{"title":"A New Basal Notoungulate from the Itaboraí Basin (Paleogene) of Brazil","authors":"Luis Otavio Rezende Castro, D. Garcia-Lopez, L. Bergqvist, H. I. de Araújo‐Júnior","doi":"10.5710/AMGH.05.02.2021.3387","DOIUrl":"https://doi.org/10.5710/AMGH.05.02.2021.3387","url":null,"abstract":"Abstract. A new basal notoungulate, Nanolophodon tutuca gen. et sp. nov., is described. This is represented by maxillary and dental fragments and by isolated teeth. The holotype and referred material were found at the “1968 Fissure” of the Itaboraí Basin, Rio de Janeiro State, Brazil. This basin has been regarded as early Eocene in recent contributions. The generalized appearance and brachydonty of the studied specimens, together with the presence of certain typical traits (poorly developed entolophid, well-developed metacone column, etc.) indicate that N. tutuca can be considered among the group of genera traditionally known as henricosborniids, easily distinguishable from Typotheria by the absence of crista 1 and from Toxodontia by the absence of crista intermedia. It is also different from all other henricosborniids by a combination of characters, such as the presence of a long crochet, the development of two small cristae in the ectoloph, and the large paraconid, among others. In the context of a phylogenetic analysis performed, we do not find conclusive evidence about the synonymy between Itaboraitherium atavum and Othnielmarshia pristina. In turn, we question the reference of these forms as henricosborniids, based on the complex occlusal dental pattern observed in both cases. Finally, based on the observations made in the present study, we discuss the identification of the paraconid in notoungulates, which may be associated with some cusps located mesially to the metaconid and identified as pseudoparaconids in past studies.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46431198","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}

引用次数: 1