Marine Micropaleontology最新文献

{"title":"Merging databases for CNN image recognition, increasing bias or improving results?","authors":"Martin Tetard ,&nbsp;Veronica Carlsson ,&nbsp;Mathias Meunier ,&nbsp;Taniel Danelian","doi":"10.1016/j.marmicro.2023.102296","DOIUrl":"https://doi.org/10.1016/j.marmicro.2023.102296","url":null,"abstract":"<div><p>Automated microscopy, image processing, and recognition using artificial intelligence is getting a growing interest from the scientific community, as more and more research centres are actively working on building datasets of images for training convolutional neural networks (CNNs) to identify microscopic objects. However, images acquired between institutes might show differences in light and contrast intensity leading to potential bias in identification when using datasets or CNNs from another institute.</p><p>One might then question if combining datasets acquired in different conditions is likely to improve the efficiency of the resulting CNN by increasing the number of images and integrating lighting variability into the learning process, or on the contrary introduce bias in the CNN training by adding a recurrent noise, common to all classes, through a substantial light and contrast variability.</p><p><span>In order to ease collaboration between laboratories, two datasets of middle Eocene </span>radiolarian images, acquired separately at GNS Science (NZ) and the University of Lille (France), were generated to assess the accuracy of CNNs trained on both datasets individually, and also when combined into a third dataset. The performance of the three resulting CNNs was then evaluated on new images acquired at both institutions.</p><p>Finally, the new radiolarian dataset generated at GNS allowed to easily detect unknown taxa, which are otherwise abundant in the studied material. Seven new species are described: <em>Ceratospyris metroid</em> n. sp., <em>Ceratospyris okazakii</em> n. sp., <em>Desmospyris biloba</em> n. sp., <em>Botryostrobus lagena</em> n. sp., <em>Buryella apiculata</em> n. sp., <em>Lophocyrtis cortesei</em> n. sp., and <em>Cromyosphaera fulgurans</em> n. sp.</p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"185 ","pages":"Article 102296"},"PeriodicalIF":1.9,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49738801","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}

{"title":"The biphasic life cycle of the non-spinose planktonic foraminifera is characterised by an aberrant coiling signature","authors":"Kate F. Darling ,&nbsp;Katrine Husum ,&nbsp;Isabel S. Fenton","doi":"10.1016/j.marmicro.2023.102295","DOIUrl":"https://doi.org/10.1016/j.marmicro.2023.102295","url":null,"abstract":"<div><p>The complete lifecycle of the planktonic foraminifera has continued to remain obscure. Benthic foraminifera exhibit an obligate alternation of generations between haploid gamonts and diploid agamonts, yet despite years of observation, the fusion of gametes to form a zygote, gamont or agamont has never been observed in the planktonic groups. Recent evidence from <em>Neogloboquadrina pachyderma</em> culture confirms that they do have a biphasic reproductive cycle and the agamonts may exhibit dimorphism in coiling direction. In this study we examine the morphology of normal and aberrant coiling tests of both <em>N. pachyderma</em> and <em>N. incompta</em> from three Arctic and North Atlantic water masses, to explore whether aberrant coiling is an indicator of a biphasic life cycle in the non-spinose planktonic foraminifera group as a whole. Using a Nano-Computed Tomography scanning approach, we morphologically compared the proloculus and growth trajectories of aberrant and normal coiling tests. Aberrant coiling tests were found to have a slightly larger proloculus and test size, consistent with a left coiling <em>N. pachyderma</em> agamont in the literature. This degree of dimorphism is insufficient to discriminate agamonts in the wild population and coiling direction remains their only distinguishable feature without further morphological investigation. The constant low-level aberrant coiling signature in a range of non-spinose planktonic foraminiferal genera implies that a biphasic life cycle is the principal mode of reproduction in the non-spinose planktonic group.</p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"185 ","pages":"Article 102295"},"PeriodicalIF":1.9,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49738567","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}

{"title":"Morphometrics and machine learning discrimination of the middle Eocene radiolarian species Podocyrtis chalara, Podocyrtis goetheana and their morphological intermediates","authors":"Francisco Pinto ,&nbsp;Veronica Carlsson ,&nbsp;Mathias Meunier ,&nbsp;Bert Van Bocxlaer ,&nbsp;Hammouda Elbez ,&nbsp;Marie Cueille ,&nbsp;Pierre Boulet ,&nbsp;Taniel Danelian","doi":"10.1016/j.marmicro.2023.102293","DOIUrl":"https://doi.org/10.1016/j.marmicro.2023.102293","url":null,"abstract":"<div><p><span>We present various approaches to distinguish the middle Eocene species </span><em>Podocyrtis chalara</em> and <em>Podocyrtis goetheana</em>, which are end members of a trajectory of phenotypic change, and their intermediate morphogroups. We constructed a set of thirteen traditional morphological variables to classify the entire morphological variability encompassed by the two morphospecies and their intermediates <em>Podocyrtis</em> sp. cf. <em>P. chalara</em> and <em>Podocyrtis</em> sp. cf. <em>P. goetheana</em><span>. We used two methods of classification, namely Linear Discriminant Analysis<span> (LDA) and machine learning using artificial neural networks. LDA performed on the morphometric data reveals a good discrimination for </span></span><em>P. chalara</em>, <em>P. goetheana</em> and <em>Podocyrtis</em> sp. cf. <em>P. goetheana</em>, but not for <em>Podocyrtis</em> sp. cf. <em>P. chalara</em>. We used three approaches of machine learning based on different neural networks: a Convolutional Neural Network (CNN) and two Spiking Neural Networks (SNNs). Each of these neural networks was trained based on classified images of the two morphospecies and their morphological intermediates, thus constituting a different set of input data than the morphometric dataset for LDA. The neural network approaches identified the same three morphospecies recognized by LDA from a dataset of traditional measurements, i.e. <em>P</em>. <em>chalara</em>, <em>P</em>. <em>goetheana</em> and <em>Podocyrtis</em> sp. cf. <em>P. goetheana</em>, with up to 92% accuracy. Our results highlight the great potential and promising perspectives of machine learning and neural networks in the application of image-based object recognition for morphological classification, which may also contribute to more objective taxonomic decisions.</p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"185 ","pages":"Article 102293"},"PeriodicalIF":1.9,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49738564","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}

{"title":"Integrated statistical analysis of calcareous nannofossil and elemental geochemistry of an outcrop from of the eastern Cenomanian Western Interior Seaway: Novel insights of shallow marine paleoceanography and nannoplankton paleoecology","authors":"Jonathan D. Schueth,&nbsp;Kelly Johnson","doi":"10.1016/j.marmicro.2023.102290","DOIUrl":"10.1016/j.marmicro.2023.102290","url":null,"abstract":"<div><p><span>Phytoplankton<span><span> assemblages in shallow marine environments are being impacted by anthropogenic climate change, but long-term outcomes of these changes are uncertain. Investigation of past neritic calcareous nannoplankton<span><span> can help us understand the fate these ecosystems face. In this study, a Canonical Correspondence Analysis (CCA) of calcareous nannofossils<span> and X-ray fluorescence geochemistry<span> was used to determine how past planktonic ecosystems were influenced by paleoenvironmental parameters on the eastern side of the Late Cretaceous Western Interior Seaway in the </span></span></span>Cenomanian (ca. 95–93 Ma). Samples were collected every 10 cm from the Graneros Shale Greenhorn Formation at an outcrop in northwestern Iowa to determine high resolution changes in assemblages and </span></span>paleoenvironments. Nannofossil diversity outside of a few small intervals ranges is high (generally 30–60 species) with abundant small </span></span><em>Biscutum constans</em><span><span>, confirming other publications that show elevated diversity in Cretaceous nearshore settings. The CCA results imply assemblages were most influenced by terrigenous influence, wet vs. dry climate, and changes in water mass source. Cretaceous nannofossil </span>paleoecology<span> was also revised based on the CCA results. Size differentiation of nannofossil taxa may highlight more complexity in environmental preferences that have been largely overlooked. After the initial transgression of the Greenhorn Sea into the region, the climate became wetter and terrigenous influence in the area was high. The peak of terrigenous influence corresponds with elevated nannofossil diversity but a lack of microfauna, which may indicate a similar oceanographic setting to the modern Gulf of Mexico nearshore dead zone. As sea level continued to rise above this point, nannoplankton assemblages indicate a potential shift to a higher productivity, stratified water column. As the muddy Graneros Shale transitioned to a further offshore chalky Greenhorn Formation, a normal marine, cosmopolitan nannofloral assemblage became established. Nannofossil and geochemical evidence indicates high productivity from upwelling might be related to the change of deposition to chalk in the Greenhorn Formation. While only a single outcrop was investigated, the novel use of an integrated micropaleontological and geochemical analysis has shed light on the dynamics of how phytoplankton ecosystems were established and modified in shallow marine environments of the Cretaceous and could have important implications on modern shallow marine settings.</span></span></p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"184 ","pages":"Article 102290"},"PeriodicalIF":1.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46455724","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}

{"title":"Conodont size in time and space: Beyond the temperature-size rule","authors":"Catherine Girard ,&nbsp;Anne-Lise Charruault ,&nbsp;Anne-Béatrice Dufour ,&nbsp;Sabrina Renaud","doi":"10.1016/j.marmicro.2023.102291","DOIUrl":"10.1016/j.marmicro.2023.102291","url":null,"abstract":"<div><p><span>The temperature-size rule (TSR) states that ectotherms mature at smaller adult body size in warmer conditions. Such a rule may have the potential to explain size response of fossil<span> organisms to past temperature variations, but its validity in deep time has been seldom tested. The generality of this rule was investigated here by compiling data documenting the size record of three conodont genera (</span></span><em>Palmatolepis, Ancyrodella</em> and <em>Polygnathus</em><span><span>) at different spatial and temporal scales during the Late Frasnian<span> and the Famennian, characterized by short- and long-term temperature variations. Statistical models were used to investigate the relationship between conodont size and </span></span>oxygen isotope<span> values, considered as paleotemperature proxies. Comparison of evolutionary models further allowed to test alternative modes of size variation such as stasis or punctuation.</span></span></p><p>The TSR was not validated as a general rule explaining size variation in these fossil records, being only observed as a large-scale geographic trend during a time-slice. The only strong support for temperature being the driver of temporal variations was found regarding the size of <em>Palmatolepis</em> during the Kellwasser period, but the relationship was reverse to the expectation of the TSR. The absence of general TSR pattern is probably due to the interference of many other factors (demography and mortality patterns, temperature tolerance, size reduction due to stress) whose relative importance may depend on the time interval and the genus considered. Rather than a correlation with environmental proxies, evolutionary models suggested the occurrence of a synchronous shift in <em>Palmatolepis</em> size around 369 Ma (<em>Palmatolepis termini</em> conodont Zone) in several outcrops, raising questions about the environmental forcing beyond this shift. Departures from the expected TSR may thus provide relevant insights into the complex interplay of physical, tectonic and eco-evolutionary processes impacting size evolution in deep time.</p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"184 ","pages":"Article 102291"},"PeriodicalIF":1.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44392034","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}

{"title":"Distribution of modern benthic foraminiferal assemblages across the Northeast Greenland continental shelf","authors":"Joanna Davies ,&nbsp;Jeremy Lloyd ,&nbsp;Christof Pearce ,&nbsp;Marit-Solveig Seidenkrantz","doi":"10.1016/j.marmicro.2023.102273","DOIUrl":"10.1016/j.marmicro.2023.102273","url":null,"abstract":"<div><p>Analysis of benthic foraminifera in surface samples from 23 sites on the Northeast Greenland continental shelf reveal key assemblage differences between sites. Cluster analysis creates two clear geographical faunal assemblage zones: the 1) inner shelf, and 2) mid and outer shelf sites. These assemblages differ significantly, with the inner shelf sites being characterised by a high percentage and concentration of calcareous species, whilst the mid and outer shelf sites are dominated by agglutinated taxa. At almost all sites, the calcareous assemblages are dominated by <em>Cassidulina neoteretis</em> and <em>Cassidulina reniforme</em>, suggesting that they thrive across the shelf. <em>Stetsonia horvathi</em>, <em>Oridorsalis tener</em>, as well as <em>Glomulina oculus</em> and other miliolid species are found to be key calcareous species at many sites in the inner shelf zone, but they are rare-to-absent on the mid and outer shelf. Canonical correspondence analysis shows that September sea-ice cover and bottom water oxygen content are positively correlated with benthic foraminiferal assemblages at inner shelf sites, whereas organic carbon content is correlated with those in the mid and outer shelf. The formation of seasonal sea-ice and the Northeast Water polynya rejects brine into surrounding waters and transports CO₂ to the seafloor, creating a highly corrosive environment for calcium carbonate. These environments are also highly productive, as indicated by the high organic carbon content and low bottom water oxygen content. The oxidation of this organic material creates CO₂. We propose that these processes are key drivers in the dissolution of calcareous tests. In contrast, extensive sea-ice, high bottom water oxygen content and low primary productivity in the glacier-proximal region facilitates carbonate preservation.</p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"184 ","pages":"Article 102273"},"PeriodicalIF":1.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45984035","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}

{"title":"No dramatic changes observed in subtropical radiolarian plankton assemblages during the Middle Eocene Climatic Optimum (MECO); evidence from the North Atlantic ODP Site 1051","authors":"Mathias Meunier,&nbsp;Taniel Danelian","doi":"10.1016/j.marmicro.2023.102272","DOIUrl":"10.1016/j.marmicro.2023.102272","url":null,"abstract":"<div><p><span>The Middle Eocene Climatic Optimum (MECO; ca. 40 Ma) was a prominent </span>global warming<span> event that lasted 400 kyr and was characterized by a 4–6 °C rise in high latitude surface and deep-water temperatures. As the radiolarian<span> plankton response to this warming event is practically unknown, whole assemblage quantitative analyses were undertaken on well-preserved radiolarian assemblages from ODP Site 1051 (western North Atlantic). Although radiolarians have apparently benefited at this site from increase in oceanic fertility induced by the MECO, this event does not appear to have had a severe impact on subtropical radiolarian fauna. No prominent faunal turnover was found in the studied interval, suggesting that subtropical radiolarians are relatively resilient to transient warming events. Likewise, variations in radiolarian assemblage composition establish that ocean warming induced only a weak ecological response. One of the most striking faunal changes associated with the MECO is the clear increase in radiolarian diversity (taxic richness), as a result of the northward migration of warm tropical radiolarian species. Similarly, several typical middle Eocene tropical species are found to be more abundant in the warmest interval. In addition to these poleward migrations, we identified three radiolarian clusters composed of warm-water or cool-water species, as well as two abundant artostrobiid species which may represent nutrient opportunists.</span></span></p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"184 ","pages":"Article 102272"},"PeriodicalIF":1.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45542818","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}

{"title":"Model of phylomorphogeny of P1 elements of the Tournaisian (Mississippian) siphonodellids","authors":"Artem N. Plotitsyn,&nbsp;Andrey V. Zhuravlev","doi":"10.1016/j.marmicro.2023.102294","DOIUrl":"https://doi.org/10.1016/j.marmicro.2023.102294","url":null,"abstract":"<div><p><span>Conodonts are a group of extinct marine organisms widely used in Paleozoic and Triassic biostratigraphy. The genus </span><em>Siphonodella</em><span><span> comprises ozarkodinid conodonts from the latest Famennian to the middle </span>Tournaisian. The phylogenetic model of this genus plays an important role in biostratigraphy. This study is based on the authors' and published data on 31 species of siphonodellids of cosmopolitan and East European groups. A new phylomorphogeny of </span><em>Siphonodella</em> is proposed on the basis of known mechanisms of morphological transformations of siphonodellid P₁<span> elements during speciation processes, presence of interspecies transitional forms, and data on ontogeny. The main morphogenetic pathways in the evolution of siphonodellids are the following: formation and transformation of the rostrum, transformation of the platform outline, transformation of the platform ornamentation, transformation of the keel, and histological transformations. In the process of modeling the phylomorphogeny of </span><em>Siphonodella</em>, some taxonomic problems are solved: a new species <em>S. thompfelli</em> is described, a new variant of the division of <em>S. lobata</em><span> (Branson and Mehl) into morphotypes is proposed, the validity of </span><em>S. plana</em> (Huddle), <em>S. praeplana</em> Bardasheva, Bardashev, Weddige and Ziegler, and <em>S. gladia</em><span> Zhuravlev and Plotitsyn is clarified, and the knowledge of the morphospace of most representatives of the genus is extended. The phylogeny of siphonodellids provides a basis for the new phylogenetic zonal sequences based on the conodont phylogenetic-zone concept.</span></p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"184 ","pages":"Article 102294"},"PeriodicalIF":1.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49723104","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}

{"title":"Shape diversity in conodont elements, a quantitative study using 3D topography","authors":"Alexandre Assemat ,&nbsp;Ghislain Thiery ,&nbsp;Thibaud Lieffroy ,&nbsp;Catherine Girard","doi":"10.1016/j.marmicro.2023.102292","DOIUrl":"https://doi.org/10.1016/j.marmicro.2023.102292","url":null,"abstract":"<div><p>The flourishment of conodont<span> diversity through the Paleozoic is evidenced by the strong diversification of the shape of the elements composing their feeding apparatus. Among the different elements that compose the feeding apparatus, the platform elements (P1) are the most robust. However, the P1 elements also represent the most posterior dental elements of the apparatus, performing therefore the ultimate stage of food processing before ingestion of the food bowl. Thus, characterizing the shape of these elements across various species of conodonts could be relevant to decipher the diversity of feeding behavior among this group. Here we use topographic indices initially developed for the description of teeth relief (RFI, Slope), orientation (OPCr) and sharpness (ARC, DNE) to discriminate quantitatively P1 element shapes among conodont communities of the Late Famennian from the Montagne Noire Area (south France). We evidence methodological considerations such as voxel size impact on topographic indices that should be imperatively considered before conducing these methods on conodonts. Under several homogeneous conditions, this quantification of shape diversity, even on poorly damaged specimens, could bring new clues for the understanding of P1 elements kinematics and feeding strategies among conodonts.</span></p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"184 ","pages":"Article 102292"},"PeriodicalIF":1.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49737070","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}

{"title":"Pseudofurnishius (Conodonta) from the Triassic Drežnica section, Bosnia and Herzegovina","authors":"Tea Kolar-Jurkovšek ,&nbsp;Carlos Martínez-Pêrez ,&nbsp;Hazim Hrvatović ,&nbsp;Dunja Aljinović ,&nbsp;Špela Goričan ,&nbsp;Ferid Skopljak ,&nbsp;Bogdan Jurkovšek","doi":"10.1016/j.marmicro.2023.102271","DOIUrl":"10.1016/j.marmicro.2023.102271","url":null,"abstract":"<div><p>Triassic strata in the Drežnica section, Bosnia and Herzegovina have been examined biostratigraphically. The limestone and dolostone strata were deposited in deep pelagic environment. The conodont faunas are marked by prevailing elements of the genus <em>Pseudofurnishius</em> including clusters that enabled to distinguish the <em>huddlei</em> (lower Longobardian) and <em>murcianus</em> (upper Longobardian–?Cordevolian) Zones, the later fauna is characterized by the presence of <em>Budurovignathus</em> with rare representation of <em>Gladigondolella</em> and <em>Paragondolella.</em> This is the first report on recovery of <em>Pseudofurnishius</em> in the region.</p></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"183 ","pages":"Article 102271"},"PeriodicalIF":1.9,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46191620","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}